CBSE Class 11 Chemistry Classification of Element And Periodicity In Properties Worksheet

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Chapter 3 Classification of Elements and Periodicity in Properties Chemistry Worksheet for Class 11

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Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Worksheet Pdf

CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
 
1. Write the symbol and IUPAC name of the element with atomic number 126.
 
2. Among the elements of the third period, pick out the element with
i. highest first IE
ii. largest atomic radius
iii. most reactive non-metal
iv. most reactive metal
 
3. Which atom in each of the following pairs has greater first IE? Give reasons.
 
a) B or C    b) N or O      c) F or Ne     d) Cl or F     e) K or Ar     f) Kr or Xe
 
4. Arrange the following in increasing order of size by giving reason
 
a) K, K+     b) I+, I , I-      c) Li+, Na+     d) P, As      e) Mg2+, Na+     f) O2-, F-
 
5. Predict the position in the periodic table
 
i) (n-1)d1 ns2 where n=4 ii) (n-1) d2 ns2 where n=5
 
6. If A = 1s2, 2s2, 2p1 B = 1s2, 2s2, 2p6, 3s2, 3p1
C = 1s2, 2s2, 2p6, 3s2, 3p3 D = 1s2, 2s2, 2p6, 3s2, 3p5
E = 1s2, 2s2, 2p6, 3s2, 3p6, 4s2 F = 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d1
 
i) Which is the most metallic?
ii) Which has the highest negative value for electron gain enthalpy?
iii) Which one belongs to the d-block?
iv) Which is a halogen?
v) Which two elements are in the same group?
vi) Which element belongs to the 13th group?
 
7. The first & second ionization enthalpies &electron gain enthalpies of elements A, B, C.&D are as follows

CBSE Class 11 Chemistry Classification of Element And Periodicity In Properties Worksheet 1

Identify the element which is likely to be a
i. most reactive non-metal iii. most reactive metal
ii. a noble gas iv. metal forming binary halide (MX2)
 
8. Explain why?
 
i. Lanthanides and actinides are placed separately in the periodic table
 
ii. IE of Na+ is almost double that of Ne.
 
iii. Third period contains only 8 elements.
 
iv. Cl- is larger than Cl.
 
v. IE2 of Na is greater than IE2 of Mg.
 
vi. IE1 of B is 800kJ/mole while IE1 of Be is 900kJ/mole.
 
vii. ΔegH of F is less negative than that of Cl.
 
viii. IE1 of N is 1402kJ while that of O is 1314kJ.
 
ix. Li & Mg resemble in many of their properties.
 
9. Arrange the following elements S, P, O, N in the increasing order of non-metallic character
 
10. What is the difference between electron gain enthalpy and electro negativity?
 
11. What are isoelectronic species? Name the species that will be isoelectronic with each of the following atoms or ions. (i) F- (ii) Ar (iii) Mg2+ (iv) Rb+
 
12 Explain why cations are smaller than corresponding atoms whereas anions are larger than their parent atoms.
 
13 Define ioinsation enthalpy. What are the various factors due to which the ionization enthalpy of the main group elements tends to increase across a period?
 
14 Write the general characteristics and the outer electronic configuration of the following
i. s block elements iii. f block elements
ii. p block elements iv. d block elements
 
15 What do you mean by screening effect?
 
16 To which group and period will the element with atomic number 111 belong?
 
17 What is the oxidation state and covalency of [Al Br(NH3)5]2+?
 
18 What are representative elements?
 
19 What are i.) d block elements ii.) f block elements?
 
20 With the help of chemical equations explain the nature of sodium oxide and Aluminium oxide.

 

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CBSE Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Worksheet

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