MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
The atomic numbers of the actinide series are:
Think it through first, then pick an option.
- a 104 − 118
- b 89 − 103
- c 74 − 88
- d 57 − 71
Answer and explanation
Correct answer: b 89 − 103
Actinides have atomic numbers 89 to 103.
Why the other options are wrong
- a 104 − 118: 104 to 118 sit in the main table of period 7. The answer is 89 − 103.
- c 74 − 88: 74 to 88 are main-table elements of periods 6 and 7. The answer is 89 − 103.
- d 57 − 71: 57 to 71 is the lanthanide series. The answer is 89 − 103.
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