CBSE Class 11 Chemistry Classification Of Elements And Periodicity Worksheet Set A

CBSE Class 11 Chemistry Worksheet - Classification of Elements and Periodicity (1) CBSE,CCE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.  


1. All questions are compulsory.

2. Please give the explanation for the answer where applicable.

Q1 - What are transition elements? (2 Marks)

Q2 - Why the electron affinity of chlorine is more than that of fluorine? (2 Marks)

Q3 - Which will have higher first ionisation energy N or O and why? (3 Marks)

Q4 - Why the value of second electron affinity is positive whereas first electron affinity is always negative? (3 Marks)

Q5 - Why the first member of a group differs from other elements of same group? Explain. (2 Marks)

Q6 - Predict formula of stable binary compound that would be prepared by following the pair of element.

(i) Al and C

(ii) Element with at. No. 55 and 35

(iii) Element with atomic no. 56 and oxygen

(iv) Element with atomic number 15 and Fluorine

(v) Pb and element with atomic number 16. (5 Marks)

Q7 - Arrange O2-, S2-, N3- and F- in increasing order of radii. (1 Mark)

Q8 - Write four species which are isoelectronic with Ca2+. (1 Mark)

Q9 - Write the IUPAC name of the following elements with atomic number:

(i) 103 (ii)110    (1 Mark)


Please refer to the link below for CBSE Class 11 Chemistry Worksheet - Classification of Elements and Periodicity (1)



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