MCQ
Which of the following sequences contain atomic numbers of only representative elements?
- A3, 33, 53, 87
- B2, 10, 22, 36
- C7, 17, 25, 37, 48
- D9, 35, 51, 88
✓
Answer
- 3, 33, 53, 87
- 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.
- 3 – Group 1, 33 – group 15, 53 – group 17 and 87 – group 1.
- 9 – Group 17, 35 – Group 17, 51 – Group 15, 88 – Group 2.
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