Multiple Choice
How many valence electrons are in a neutral atom of magnesium (Mg)?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons does a neutral magnesium atom have?
A
1
B
6
C
8
D
2
Verified step by step guidance1
Identify the element in question, which is magnesium (Mg).
Determine the atomic number of magnesium, which is 12, meaning it has 12 protons and, in a neutral atom, 12 electrons.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of magnesium: \$1s^2 2s^2 2p^6 3s^2$.
From the electron configuration, observe that the outermost shell (the third shell) has 2 electrons in the 3s subshell, so magnesium has 2 valence electrons.
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