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Question

Atomic number of chlorine is 17. How many electrons are present in the M shell of a chlorine atom?

A
2
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B
8
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C
7
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D
4
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Solution

The correct option is C 7
The maximum number of electrons that can be accommodated in nth shell of an atom is given by 2n2.
ShellnMaximum no. of electronsK12L28M318
Electrons are filled from the inner shell to the outer shell. Number of electrons in chlorine atom = 17 and, electron distribution is given below -
ShellnMaximum no. of electronsK12L28M37

After complete filling of K and L shell, the remaining seven electrons are filled in shell M. Hence, seven electrons are present in the M shell of the chlorine atom.


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