Refer to CBSE Class 10 Chemistry Periodic Classification of Elements MCQs provided below available for download in Pdf. The MCQ Questions for Class 10 Science with answers are aligned as per the latest syllabus and exam pattern suggested by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 5 Periodic Classification of Elements are an important part of exams for Class 10 Science and if practiced properly can help you to improve your understanding and get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 10 Science and also download more latest study material for all subjects
MCQ for Class 10 Science Chapter 5 Periodic Classification of Elements
Class 10 Science students should refer to the following multiple-choice questions with answers for Chapter 5 Periodic Classification of Elements in Class 10.
Chapter 5 Periodic Classification of Elements MCQ Questions Class 10 Science with Answers
Question : Which of the given elements A, B , C, D and E with atomic numbers 2, 4, 8, 10 and 18 respectively belong to the same period?
a) B,C,D
b) A, B, C
c) A,D,E
d) B,D,E
Answer : B,C,D
Question : Which of the following elements would accept an electron readily:
a) Cl
b) F
c) Br
d) I
Answer : Cl
Question : An element X (2, 8, 2) combines separately with (SO4)2–and (PO4)3– radicals. The chemical formulae of the compounds are
(a) X2SO4 : X3(PO4)2
(b) XSO4 : X3(PO4)2
(c) X(SO4)2 : X2(PO4)3
(d) XSO4 : X3(PO4)3
Answer : B
Question : Two elements X and Y belong to group 1 and 2 respectively in the same period. The formulae of this oxides are
(a) XO, YO
(b) X2O, YO
(c) X2O, Y2O
(d) XO, YO2
Answer : B
Question : In the Modern Periodic Table, the metals among the first ten elements are—
(a) Be, Na
(b) Li, Be
(c) Be, Li, Na
(d) Li, Na
Answer : D
Question : Which of the following has maximum non-metallic character?
(a) F
(b) Br
(c) Cl
(d) I
Answer : A
Question : The element with atomic number 3 to 10 belong to the second period. Identify the most electropositive and most electronegative element.
(a) F, Li
(b) Li, F
(c) Li, Ne
(d) Ne, Li
Answer : B
Question : Which of the following is not the characteristics of isotopes of an element?
Isotopes of an element
(a) show same atomic mass
(b) show same atomic number
(c) occupy same position in the Periodic Table
(d) show same chemical properties
Answer : A
Question : Which of the following elements would lose an electron easily:
a) K
b) Na
c) Ca
d) Mg
Answer : K
Question : An element has 13 protons. The group and period to which it belongs:
a) 3rd period and 13th group
b) 2nd period and 13th group
c) 3rd period and 3rd group
d) 2nd period and 3rd group
Answer : 3rd period and 13th group
Question : The most metallic element in the fourth period is:
a) K
b) Ca
c) S
d) P
Answer : K
Question : Which of the following has most non metallic character:
a) F
b) N
c) C
d) O
Answer : F
Question : The lightest metal is :
a) Li
b) Na
c) K
d) Mg
Answer : Li
Question : Which of the following is the correct order of size:
a) F< Cl< Br< I
b) Cl< F< Br< I
c) I<br< cl
d) Br< I< Cl< F
Answer : F< Cl< Br< I
Question : Which of the given elements A, B , C, D and E with atomic numbers 2, 4, 8, 10 and 18 respectively belong to the same period?
a) B,C,D
b) A, B, C
c) A,D,E
d) B,D,E
Answer : B,C,D
Question : Where would you locate an element with electronic configuration 2, 8,7 in the modern periodic table?
a) Group7 and period 3
b) Group 7 and period 2
c) Group 17 and period 3
d) Group17 and period 3
Answer : Group7 and period 3
Question : Which of the following is the correct order of size:
a) I- >I > I+
b) I+ >I- > I
c) I >I+ > I
d) I >I- > I+
Answer : I- >I > I+
Question : Which of the following hydroxides are most basic:
a) Ba(OH)2
b) Be(OH)2
c) Mg(OH)2
d) Ca(OH)2
Answer : Ba(OH)2
Question : Which of the following are characteristics of isotopes of an element?
a) Isotopes of an element have same atomic masses
b) Isotopes of an element have same atomic number
c) Isotopes of an element show same physical properties
d) Isotopes of an element have same chemical properties
a) B and c
b) A, c, d
c) B, c, d
d) B and d
Answer : B and c
Question : Which amongst the following represents the correct order of decreasing metallic character of elements Na, Si, Cl, Mg, Al
a) Na> Mg> Al> Si> Cl
b) Cl> Si> Al> Mg> Na
c) Na> Si> Mg> Al> Cl
d) Al> Na> Si> Cl> Mg
Answer : Na> Mg> Al> Si> Cl
Question : Which of the following will form acidic oxide? An element with atomic number:
a) 7
b) 11
c) 21
d) 19
Answer : 7
Question : Elements with atomic number 15 and mass number 31 is present in:
a) Group15 and period 3
b) Group 5 and period 4
c) Group5 and period 3
d) Group15 and period 4
Answer : Group15 and period 3
Question : The pairs of elements with the following atomic numbers have the same chemical properties:
a) 3 & 11
b) 13 & 12
c) 4 & 24
d) 2 & 1
Answer : 3 & 11
Question : The number of elements present in the 2nd, 3rd, 4th and 5th periods of the modern periodic table are:
a) 8,8,18,32
b) 2,8,8,18
c) 8,8,18, 18
d) 8,18,18,32
Answer : 8,8,18,32
Question : The longest and the shortest periods are:
a) 6 &1
b) 1&6
c) 2&6
d) 1&7
Answer : 6 & 1
Question : The period that contains only gaseous elements are:
a) 1
b) 2
c) 3
d) 4
Answer : 1
b) Na
c) K
d) Mg
b) C
c) O
d) F
b) K
c) S
d) P
Question. The period that contains only gaseous elements are:
a) 1
b) 2
c) 3
d) 4
Answer : A
Question. The longest and the shortest periods are:
a) 1&6
b) 2&6
c) 6 &1
d) 1&7
Answer : C
Question. The number of elements present in the 2nd, 3rd, 4th and 5th periods of the modern periodic table are:
a) 2,8,8,18
b) 8,8,18,32
c) 8,8,18, 18
d) 8,18,18,32
Answer : B
Question. The pairs of elements with the following atomic numbers have the same chemical properties:
a) 13 & 12
b) 3 &11
c) 4&24
d) 2 &1
Answer : B
Question. Elements with atomic number 15 and mass number 31 is present in:
a) Group 5 and period 4
b) Group5 and period 3
c) Group15 and period 3
d) Group15 and period 4
Answer : C
Question. Which of the following will form acidic oxide? An element with atomic number:
a) 7
b) 11
c) 21
d) 19
Answer : A
Question. Which amongst the following represents the correct order of decreasing metallic character of elements Na, Si, Cl, Mg, Al
a) Cl> Si> Al> Mg> Na
b) Na> Mg> Al> Si> Cl
c) Na> Si> Mg> Al> Cl
d) Al> Na> Si> Cl> Mg
Answer : B
Question. Which of the following are characteristics of isotopes of an element?
a) Isotopes of an element have same atomic masses
b) Isotopes of an element have same atomic number
c) Isotopes of an element show same physical properties
d) Isotopes of an element have same chemical properties
i. A, c, d
ii. B, c, d
iii. B and c
iv. B and d
Answer : C
Question. Where would you locate an element with electronic configuration 2, 8,7 in the modern periodic table?
a) Group 7 and period 2
b) Group7 and period 3
c) Group 17 and period 3
d) Group17 and period 3
Answer : B
Question. Which of the given elements A, B , C, D and E with atomic numbers 2, 4, 8, 10 and 18 respectively belong to the same period?
a) A, B, C
b) B,C,D
c) A,D,E
d) B,D,E
Answer : B
Question. Which of the following hydroxides are most basic:
a) Be(OH)2
b) Mg(OH)2
c) Ca(OH)2
d) Ba(OH)2
Answer : D
Question. Which of the following is the correct order of size:
a) I+ >I- > I
b) I- >I > I+
c) I >I+ > I
d) I >I- > I+
Answer : B
Question. Which of the following is the correct order of size:
a) Cl< F< Br< I
b) F< Cl< Br< I
c) I
d) Br< I< Cl< F
Answer : B
Question. The lightest metal is :
a) Li
b) Na
c) K
d) Mg
Answer : A
Question. Which of the following has most non metallic character:
a) N
b) C
c) O
d) F
Answer : D
Question. The most metallic element in the fourth period is:
a) Ca
b) K
c) S
d) P
Answer : B
Question. An element has 13 protons. The group and period to which it belongs:
a) 3rd period and 13th group
b) 2nd period and 13th group
c) 3rd period and 3rd group
d) 2nd period and 3rd group
Answer : A
Question. Which of the following elements would lose an electron easily:
a) K
b) Na
c) Ca
d) Mg
Answer : B
Question. Which of the following elements would accept an electron readily:
a) F
b) Cl
c) Br
d) I
Answer : B
b) Na
c) Ca
d) Mg
b) Cl
c) Br
d) I
Question : The law of the modern periodic table was proposed by:
(a) H.G.I Moselly
(b) Dobereincer
(c) D.I. Mendeleev
(d) Newlands
Answer : A
Question : Modern Periodic law is based upon:
(a) Number of neutrons
(b) Number of electron
(c) Atomic number
(d) Atomic mass
Answer : C
Question : Assertion: There are 118 elements dis-covered so far.
Reason: Sulphur (16) belongs to Group 16 and belongs to 3rd period.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
Answer : B
Question : The statement that is not true about electron affinity is
(a) It causes energy to be released
(b) It causes energy to be absorbed
(c) It is expressed in electron volts
(d) It involves formation of an anion
Answer: B
Question : Down a group, the electron affinity __________.
(a) increases
(b) decreases
(c) remains same
(d) increases and then decreases
Answer : B
Question : The metal which is hard and has high melting point and used in filaments of electrical bulbs is
(a) Ni
(b) Fe
(c) Pt
(d) W
Answer : D
Question : Pick out the chemically most reactive elements from the given triads.
Li, Na, K F, Cl, Br
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br
Answer : C
Question : Upto which element, the Law of Octaves was found applicable?
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium
Answer : B
Question : An element has an atomic number of 15 with which of the following elements will it show similar chemical properties.
(a) Be (4)
(b) Ne (10)
(c) N (7)
(d) O (8)
Answer : C
Question : An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
(a) Valency = 6
(b) Valency = 2
(c) Valency = 1
(d) Valency = 3
Answer : B
Question. Mendeleev peridicted the existence of two elements and named them as eka-silicon and eka-aluminium. Identify the element which took their position at later stage.
(a) Si and Ge
(b) Si and Ga
(c) Ge and Ga
(d) Si and Al
Answer : C
Question. Electronic configurations for four elements A, B, C and D are given below :
A : 2,1 B : 2,8 C : 2,8,1 D : 2,8,8
Identify the correct statements.
(i) Elements A and B belong to the second period.
(ii) Elements A and C belong to the same group.
(iii) Element C is more reactive than element A.
(iv) Elements C and D belong to the third period
(a) (i) and (iii)
(b) (i), (ii) and (iii)
(c) (ii) and (iv)
(d) All the statements are correct.
Answer : D
Question. The correct order of increasing acidic nature of SO2, SiO2, P2O3 and Al2O3 is
(a) SO2 < P2O3 < SiO2 < Al2O3
(b) Al2O3 < SiO2 < SO2 < P2O3
(c) Al2O3 < SiO2 < P2O3 < SO2
(d) SiO2 < SO2 < Al2O3 < P2O3
Answer : C
Question. It was found that the law of octaves was applicable only upto
(a) chlorine
(b) potassium
(c) calcium
(d) argon.
Answer : C
Question. The number of elements in third period of the periodic table is
(a) 2
(b) 8
(c) 10
(d) 14
Answer : B
Question. The scientist who showed that the atomic number of an element is a more fundamental property than its atomic mass is
(a) Henry Moseley
(b) Johann Wolfgang Dobereiner
(c) John Newlands
(d) Dmitri Ivanovich Mendeleev.
Answer : A
Question. “The properties of the elements are periodic function of their atomic numbers”. The statement was given by
(a) N. Bohr
(b) J. W. Dobereiner
(c) D. I. Mendeleev
(d) H. G. J. Moseley.
Answer : D
Question. Which of the following orders of atomic radii is correctly represented?
(a) B > C > N
(b) B > O > C
(c) C > B > N
(d) C > B > O
Answer : A
Question. Which statement about the elements in periodic table is correct?
(a) The elements are arranged in order of increasing atomic mass.
(b) The elements in a period have the same number of outer electrons.
(c) The elements in a group have the same number of occupied electron shells.
(d) The non-metallic characteristic of the elements decreases down a group and increases across a period.
Answer : D
Question. Which is true about electronegativity order?
(a) P > Si
(b) C > N
(c) Br > Cl
(d) Sr > Ca
Answer : A
Question. When Mendeleev started his work, the number of known elements were
(a) 68
(b) 53
(c) 57
(d) 63
Answer : D
Question. The positions of four elements K, L, M and N in the periodic table are shown below :
Which of the following statements are correct?
(I) K, L, M and N are metalloids.
(II) K is a metal while L, M and N are nonmetals.
(III) Among these four elements, K is the smallest in size.
(IV) K is a metal while L and M are metalloids and N is a non‑metal.
(a) II and III
(b) I and III
(c) III and IV
(d) None of these
Answer : B
Question. Silicon is surrounded by the elements of atomic number 6, 13, 15 and 32 in the periodic table, then
(a) the properties of the elements of atomic numbers 6 and 32 will be similar to silicon
(b) the properties of the elements of atomic numbers 13 and 15 will be similar to silicon
(c) the properties of the elements of atomic numbers 6 and 13 will be similar to silicon
(d) the properties of elements of atomic numbers 15 and 32 will be similar to silicon.
Answer : A
Question. Element M forms an ion, M 2+ and element X forms an ion, X 2–. The electronic arrangements of these ions are shown as :
Which of the following statements about the elements M and X is/are incorrect?
I. M is in group 2 and period 4 of the periodic table.
II. M is a non-metal and X is a metal.
III. X is in group 15 and period 2 of the periodic table.
IV. M and X form MX type compound.
V. On moving from M towards X in the periodic table, electronegativity decreases.
(a) II, III and V
(b) I and IV
(c) Only II
(d) II and III
Answer : A
Question. An element M forms an ion M –. The electronic configuration of this ion is (2,8). Which statement is true?
(a) M is in Group VI and Period 2.
(b) M is Group VII and Period 2.
(c) M is in Group VII and Period 3.
(d) M is in Group VI and Period 3.
Answer : B
Question. It was assumed by Newlands that only
(a) 56 elements existed in nature
(b) 57 elements existed in nature
(c) 59 elements existed in nature
(d) 63 elements existed in nature.
Answer : A
Question. Cl, Br and I is a Döberiener’s triad. If the atomic masses of Cl and I are 35.5 and 127 respectively then the atomic mass of Br is
(a) 162.5
(b) 91.5
(c) 81.25
(d) 45.625
Answer : C
Question. Which of the following properties does not match elements of halogen family?
(a) They have seven electrons in their valence shell.
(b) They are diatomic in their molecular form.
(c) They are highly reactive.
(d) They are metallic in nature.
Answer : D
Question. The ‘law of octaves’ was enunciated by
(a) Lother Meyer
(b) Mendeleev
(c) Dobereiner
(d) Newlands.
Answer : D
Question. Moving down a group of the periodic table,
(a) the number of valence electrons increases
(b) the metallic characteristics of the elements increases
(c) the ability of the elements to form positive ions decreases
(d) the atomic number of the elements decreases.
Answer : B
Question. Li, Na and K is a Dobereiner triad. The atomic masses of Li and K are 7 and 39 respectively. What is the expected mass of Na?
(a) 7
(b) 18
(c) 23
(d) 39
Answer : C
Question. Considering the elements B, Al, Mg and K, the correct order of their metallic character is
(a) B > Al > Mg > K
(b) Al > Mg > B > K
(c) Mg > Al > K > B
(d) K > Mg > Al > B
Answer : D
Question. In the third period of the periodic table, the element having smallest size is
(a) Na
(b) Al
(c) Cl
(d) Si
Answer : C
Question. According to Mendeléev’s periodic law, the properties of elements are a periodic function of their
(a) atomic numbers
(b) atomic masses
(c) atomic volumes
(d) atomic sizes.
Answer : B
Question. X, Y and Z are the three elements, each one belongs to any one of the groups IA, IIIA and VA.
The oxide of X is amphoteric, the oxide of Y is highly acidic, and the oxide of Z is highly basic.
Identify the groups to which these elements X, Y and Z belong?
X Y Z
(a) VA IA IIIA
(b) IA VA IIIA
(c) IIIA IA VA
(d) IIIA VA IA
Answer : D
Question. The elements with atomic number 3 to 10 belong to the second period. Identify the most electropositive and the most electronegative element respectively.
(a) F, Li
(b) Li, F
(c) Li, Ne
(d) Ne, Li
Answer : B
Question. Which element has the largest size in the second period?
(a) N
(b) F
(c) Li
(d) Be
Answer : C
Question. Study the given table carefully.
Identify P, Q, R, T and U.
P Q R T U
(a) Mg O Ne P Ar
(b) O Mg Ar P Ne
(c) Mg O Ar P Ne
(d) O Mg Ne P Ar
Answer : A
Question. State True (T) or False (F) for the given statements.
(i) John Newlands, arranged the known elements in the order of increasing atomic numbers.
(ii) He started with the element having the lowest atomic mass (hydrogen) and ended at thorium which was the 56th element.
(iii) He found that every ninth element had properties similar to that of the first.
(iv) The properties of lithium and sodium were found to be the same.
(v) Beryllium and magnesium resemble each other.
(vi) Newlands’ law of octaves worked well with higher elements only.
(i) (ii) (iii) (iv) (v) (vi)
(a) F T F T T T
(b) T F T F T T
(c) T F F F T T
(d) F T F T T F
Answer : D
Question. The proton numbers of four elements are given below.
Which of the following pairs of elements belong to the same group of the periodic table?
(a) W and X
(b) W and Y
(c) X and Z
(d) Y and Z
Answer : C
Question. An element X belongs to group 14th and 2nd period of the periodic table. Its atomic number will be
(a) 6
(b) 14
(c) 7
(d) 15
Answer : A
Question. According to modern periodic law, the properties of elements are a periodic function of their
(a) atomic masses
(b) atomic volumes
(c) atomic numbers
(d) densities.
Answer : C
Question. In the given metals one with the smallest size is
(a) Rb
(b) Cs
(c) K
(d) Na
Answer : D
Question. Which of the following pairs of atomic numbers represents elements belonging to the same group?
(a) 11 and 20
(b) 12 and 30
(c) 13 and 31
(d) 14 and 33
Answer : C
Question. Arrange the following atoms in the order of increasing atomic radius : F, Cl, C, O
(a) F, Cl, O, C
(b) C, O, F, Cl
(c) O, C, F, Cl
(d) F, O, C, Cl
Answer : D
Question. The proton number of four elements are given below :
Which of the following pairs of elements belong to the same period of the periodic table?
(a) W and X
(b) W and Y
(c) X and Y
(d) Y and Z
Answer : C
Question. Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table?
(a) The elements become less metallic in nature.
(b) The number of valence electrons increases.
(c) The atoms lose their electrons more easily.
(d) The oxides become more acidic.
Answer : C
Question. The given diagram shows the electron arrangement of two elements, A and B.
Which of the following statements is correct about the two elements?
(i) A is a Period 3 element.
(ii) B is a Group III element.
(iii) Both A and B have strong metallic characteristics.
(iv) Both A and B from positive ions.
(a) (ii) only
(b) (i) and (ii) only
(c) (iii) and (iv) only
(d) (i), (ii), (iii) and (iv)
Answer : B
Question. Identify the pair of atomic numbers representing s-block elements.
(a) 7, 15
(b) 9, 17
(c) 2, 10
(d) 11, 12
Answer : D
Question. The number of elements in the 5th period of periodic table are
(a) 8
(b) 18
(c) 10
(d) 32
Answer : B
Question : Which one of the following elements exhibit the maximum number of valence electrons?
(a) Na
(b) Al
(c) Si
(d) P
Answer : D
Question : A liquid non-metal is ___________.
(a) phosphorous
(b) mercury
(c) bromine
(d) nitrogen
Answer : C
Question : New lands relation is called
(a) Musical Law
(b) Law of Octaves
(c) Periodic Law
(d) Atomic Mass Law
Answer : B
Question : The first alkali metal is _________.
(a) hydrogen
(b) lithium
(c) sodium
(d) francium
Answer : B
Question : A purple coloured solid halogen is ________.
(a) chlorine
(b) bromine
(c) iodine
(d) astatine
Answer : C
Question : An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
(a) Group 1
(b) Group 4
(c) Group 2
(d) Group 3
Answer : A
Question : What is the basis of long form of the periodic table?
(a) Atomic mass
(b) Atomic number
(c) Atomic size
(d) Metallic and Non-metallic character
Answer : B
Question : The property of an element in the periodic table depends on its, ________.
(a) atomic size
(b) atomic mass
(c) electronic configuration
(d) number of protons
Answer : C
Question : An element has configuration 2, 8, 1. It belongs to, _________.
(a) 1 group and 3rd period
(b) 3 group and 1st period
(c) 1 group and 8th period
(d) 17 group and 3rd period
Answer : A
Question : The non-metallic element present in the third period other than sulphur and chlorine is
(a) oxygen
(b) fluorine
(c) nitrogen
(d) phosphorus
Answer : D
Question : At the end of each period the valence shell is __________.
(a) incomplete
(b) half filled
(c) singly occupied
(d) completely filled
Answer : D
Question : The family of elements having seven electrons in the outermost shell is ______.
(a) alkali metals
(b) alkaline earth metals
(c) halogens
(d) noble gases
Answer : C
Question : Which of the following factors does not affect the metallic character of an element?
(a) Atomic size
(b) Ionisation potential
(c) Electronegativity
(d) Atomic radius
Answer : C
Question : The family of elements to which potassium belongs is _________.
(a) alkali metals
(b) alkaline earth metals
(c) halogens
(d) noble gases
Answer : A
Question : The modern periodic table is given by ________
(a) Mendeleev
(b) Einstein
(c) Bohr
(d) Mosley
Answer: D
Question : Elements belonging to groups 1 to 17 are called __________.
(a) noble gases
(b) normal elements
(c) transition elements
(d) inner transition elements
Answer : B
Question : The number of electrons in the valence shell is equal to its ________.
(a) atomic mass
(b) group number
(c) period number
(d) atomic volume
Answer : B
Question : Lanthanides and actinides are also called ___________.
(a) normal elements
(b) transition elements
(c) noble gases
(d) inner transition elements
Answer : D
Question : The non-metals are present:
(a) On the right hand side of the periodic table.
(b) In the middle of the periodic table.
(c) In the centre of the periodic table.
(d) On the left hand side of the periodic table.
Answer : A
Question : The family of elements to which calcium belongs is __________.
(a) alkali metals
(b) alkaline earth metals
(c) halogens
(d) noble gases
Answer : B
Question : The least reactive element in group 17 is ___________.
(a) fluorine
(b) chlorine
(c) bromine
(d) iodine
Answer : D
Assertion & Reasoning Based MCQs
(a) Both assertion and reason are true, and reason is correct explanation of the assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of the assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.
Question. Assertion : According to Mendeleev’s periodic law, the properties of elements is the periodic function of their atomic numbers.
Reason : Mendeleev placed some elements with higher atomic mass before the elements with lower atomic mass.
Answer : D
Question. Assertion : Number of valence electrons decreases down the group.
Reason : Number of valence electrons increases when we move left to right in a period.
Answer : D
Question. Assertion : Group18 is placed at the extreme right of the periodic table.
Reason : It is in accordance with their electronic configuration.
Answer : A
Question. Assertion : In Newlands’ octaves, the properties of lithium and sodium were found to be same.
Reason : Sodium is the eighth element after lithium.
Answer : A
Question. Assertion : Atomic size of As is more than that of P.
Reason : Atomic size decreases along a period.
Answer : B
Question. Assertion : Elements in the same vertical column have similar properties.
Reason : Periodic properties of elements is a function of atomic number.
Answer : B
Question. Assertion : Atomic size of potassium is greater than that of sodium.
Reason : As we go down the group, atomic radius increases.
Answer : A
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