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Atomic Number and Mass Number

Which of the ...

Question

Which of the following is the correct electronic configuration of potassium?

2, 8, 9

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8, 2, 9

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2, 8, 8, 1

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1, 2, 8, 8

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Solution

The correct option is C 2, 8, 8, 1
The atomic number of potassium is 19. K shell will have 2 electrons. L shell will contain 8 electrons. M shell will also have 8 electrons and the remaining one electron will be in N shell.

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