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Question

Identify the group number of the element having its electronic configuration: 1s22s2 2p63s23p6 3d54s2

A
8
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B
7
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C
17
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D
5
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Solution

The correct option is B 7
The electronic configuration given is 1s2 2s2 2p6 3s23p63d5 4s2
Here the last electron is in the d - subshell and therefore the element is from the d - block.

In d - block:
Group number =
Number of electrons in the ns subshell + Number of electrons in the (n1)d subshell

Group Number=2+5 = 7

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