Ncert Exercises & Solutions

Which of the following sequences contains atomic numbers of only representative elements?

(a) 3, 33, 53, 87

(b) 2, 10 ,22, 36

(d) 9, 35, 51, 88

1. a and d
2. a and b
3. c and d
4. a, b, and d

(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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