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Which of the following elements shown as...

Which of the following elements shown as pairs with their atomic numbers belong to the same period?

A

Z=19 and Z=38

B

Z=12 and Z=17

C

Z=11 and Z=21

D

Z=16 and Z=35

Text Solution

Verified by Experts

The correct Answer is:
B
Z=`12,1s^(2)2s^(2)2s^(2)2p^(6)3s^(2)` (n=3)
Z=`17,1s^(2)2s^(2)2p^(6)3s^(2)3p^(5)` (n=3)
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