Question

Whic of te following sequences contain atomic numbers of only representative elements?
(a) 3, 33 53, 87,
(b) 2,10,22,36
(c) 7,17,25,37,48
(d) 9,35,51,88

Answer 1

Answers: (a) 3, 33 53, 87, and (d) 9,35,51,88

Elemnts of s and p - block elements are called representative elements. Elemnts 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 transltion elements.
With reference to this division, elements listed under option (a) and option (d) are all representative elements.