Which one contains a filled orbital of electrons in the ground state of helium?

1 s

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2 s

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3 s

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3 p

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3 d

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Solution

The correct option is A $1 s$
1s orbital contains a filled orbital of electrons in the ground state of helium.
The ground state electronic configuration of helium is $1 s^{2}$ .
Thus 1s orbital contains 2 electrons and is completely filled.

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