How many valence electrons does magnesium (Mg) have?
A. 12
B. six
C. three
D. two
Magnesium (Mg) has two valence electrons.
To determine the number of valence electrons in an atom, you need to look at its electron configuration. The electron configuration of magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
The highest energy level, or the outermost electron shell, is the third shell (3s²). The "2s²" and "2p⁶" electron shells are the inner shells.
To count the valence electrons, you need to focus on the outermost shell. In this case, the 3s² shell contains two electrons. Therefore, the answer is option D. magnesium (Mg) has two valence electrons.
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The two figures shown below are congruent. Identify the corresponding sides and angles.
The two figures shown below are congruent. Identify the corresponding sides and angles.
The two figures shown below are congruent. Identify the corresponding sides and angles.
The two figures shown below are congruent. Identify the corresponding sides and angles.