Ncert Exercises & Solutions

16. Which of the following sequences contain atomic numbers of only representative elements?

(a) 3, 33, 53, 87

(b) 2, 10 ,22, 36

(d) 9, 35, 51, 88

(a, d)

Elements of s and p-block elements are called representative elements. Elements of d-block (Z=21-30; 39-48; 57 and 72-80; 89 and 104-112) are called transition elements while those of f-block (with Z=58-71 and Z=90-103) are called inner transition elements.

With reference to this division, elements listed under option (a) and option (d) are all representative elements.

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