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Bohr's Model of a Hydrogen Atom

A neutral ato...

Question

A neutral atom of an element has 2K, 8L and 5M electrons. Find out the following?
The atomic number of neutral atom :

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 B 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.

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$

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