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Question

A neutral atom of an element has 2K, 8L and 5M electrons. Atomic number of neutral atom is:

A
20
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B
18
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C
15
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D
25
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Solution

The correct option is C 15
The number of electrons in the shells is given as 2 in K shell, 8 in L shell and 5 in the M shell. Thus, the atom has in total of 2+8+5=15 electrons.
This means that the atom is phosphorus.

The electronic configuration will be as follows.
1s22s22p63s23p3

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