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Electronic Configuration

An element is...

Question

An element is represented as $_{20}^{40} X$ . Find the number of valence electrons in it.

A

2

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B

3

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C

1

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D

4

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Solution

The correct option is A
2

The atomic number of X is 20.The electronic configuration of X is 2,8,8,2. So the number of valence electrons in the element is 2.

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