The number of valence electrons in potassium atom are:

2

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1

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3

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5

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Solution

The correct option is B $1$
Potassium is a group 1 element with atomic number 19.

So electronic configuration is 2,8,8,1

so outermost shell has 1 electron.

Option B is correct.

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(a) 2

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(d) 5

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