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Question
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
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Solution
(i) 3, 33, 53, 87
(iv) 9, 35, 51, 88
Explanation:
Elements of 5 and p-block elements are called representative elements. Elements of f-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.
(i) 3 – Group 1, 33 – group 15, 53 – group 17 and 87 – group 1.
(iv) 9 – Group 17, 35 – Group 17, 51 – Group 15, 88 – Group 2.
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