객관식
How many valence electrons does boron (B) have?
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Valence Electrons of Elements
객관식
How many valence electrons are present in a neutral atom of magnesium (Mg)?
A
8
B
4
C
6
D
2
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검증된 단계별 안내1
Identify the atomic number of magnesium (Mg), which is 12. This means a neutral Mg atom has 12 electrons.
Determine the electron configuration of Mg by filling the orbitals in order: 1s, 2s, 2p, 3s, etc.
Write the electron configuration for Mg: \$1s^2 2s^2 2p^6 3s^2$.
Recognize that valence electrons are the electrons in the outermost shell (highest principal quantum number). For Mg, this is the 3rd shell.
Count the electrons in the outermost shell (3s orbital), which gives 2 valence electrons for magnesium.
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