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Question

An element has 13 electrons in its M shell and 1 electron in N shell in ground state. Identify the element.

A
Chromium
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B
Iron
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C
Manganese
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D
Copper
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Solution

The correct option is A Chromium
M shell means it is third shell n=3
Number of electrons in M shell=13
3s23p63d5
and N shell means it is fourth shell n=4
Number of electrons in N shell=1
4s1
thus the electronic configuration is: (1s2)(2s22p6)(3s23p63d5)(4s1)
The element is Chromium (Cr).

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