A) \[32\]
B) \[10\]
C) \[18\]
D) \[8\]
Correct Answer: C
Solution :
The fifth period is from rubidium \[(37)\] to xenon\[(54)\]. The last electron enters in \[5s,\,\,\,4d\] or \[5p\] orbitals. Therefore, the fifth period has\[(2+10+6)18\] elements.
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