A neutral magnesium atom ( Z = 12) is in its ground state electronic configurati

Question

A neutral magnesium atom

(Z = 12)

is in its ground state electronic configuration. How many of its electrons are in the n = 3 level?
electrons

Explain how you arrived at your answer.

__The n = 1 level contains 1 electron, the n = 2 level contains 6 electrons, and the n = 3 level contains 5 electrons. __The n = 1 level contains 2 electrons, the n = 2 level contains 8 electrons, and the n = 3 level contains 2 electrons.    

__The n = 1 level contains 2 electrons, the n = 2 level contains 8 electrons, and the n = 3 level contains 4 electrons.

__The n = 1 level contains 1 electron, the n = 2 level contains 8 electrons, and the n = 3 level contains 3 electrons. __The n = 1 level contains 8 electrons, the n = 2 level contains 2 electrons, and the n = 3 level contains 3 electrons.

Explanation / Answer

Since Z=12, we have to fill 12 electrons startign with n=1.
Orbital No of electrons

So n=3 ahs only 2 electrons

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