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Question

The sum of total number of electrons that can be accomodated in first, second and third energy shells is

A
18
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B
20
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C
24
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D
28
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Solution

The correct option is D 28
In the solar system model, nucleus is at the centre of the atom. Moving away from the nucleus, the first energy shell can hold 2 electrons, the second shell can hold 8 electrons and the third shell can hold 18 electrons to the maximum.

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