How many valence electrons are in an atom of magnesium?

Answer 1

Henry Antrim

Magnesium has two valence electrons.

The electron configuration for magnesium is shown below.

#1s^2 2s^2 2p^6 3s^2#

The valence elctrons are the electrons in the third energy level (3s sublevel has two electrons in an atom of Mg)

Here is a video which discusses how to determine the electron configuration of magnesium.

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Answer 2

Wyatt Adkins

Magnesium has two valence electrons.

Magnesium is element 12 and belongs to Group 2 of the Periodic Table. An element in Group 2 has two valence electrons.

Also, the electron configuration of Mg is 1s² 2s²2p⁶ 3s² or [Ne]3s². Since the 3s² electrons are the outermost electrons, magnesium has two valence electrons.

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Answer 3

Noah Aldrich

An atom of magnesium has 2 valence electrons.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.