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Question

The number of p-electrons in bromine atom is:
7
17
15
13

A

17

B

13

C

7

D

15

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Solution

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$B r - 35$
Its electronic configuration is given as:
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{5}$
So, total p-electrons =6+6+5
= 17

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