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Home » Which of the following sequences contain atomic numbers of only representative elements?(i) 3, 33, 53, 87(ii) 2, 10, 22, 36(iii) 7, 17, 25, 37, 48(iv) 9, 35, 51, 88
Which of the following sequences contain atomic numbers of only representative elements?
(i) 3, 33, 53, 87
(ii) 2, 10, 22, 36
(iii) 7, 17, 25, 37, 48
(iv) 9, 35, 51, 88
CBSE | Chemistry | Class 11 | Classification of Elements and Periodicity in Properties | NCERT Exemplar
Which of the following sequences contain atomic numbers of only representative elements?
(i) 3, 33, 53, 87
(ii) 2, 10, 22, 36
(iii) 7, 17, 25, 37, 48
(iv) 9, 35, 51, 88

Option (i) and (iv) are the answers.

Representative elements are elements from the 5 and p-blocks. Transition elements belong to the f-block (Z=21–30; 39–48; 57 and 72–80; 89 and 104–112), while inner transition elements belong to the f-block (Z = 58–71 and Z = 90–103).

(a) Groups 3 and 1, 33 and 15, 53 and 17, and 87.

(d) Groups 9–17, 35–17, 51–15, and 88–2.

i

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