객관식
Which part of the atom is responsible for forming chemical bonds?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does magnesium (Mg) have?
A
6
B
2
C
4
D
8
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검증된 단계별 안내1
Identify the element in question, which is magnesium (Mg).
Determine the atomic number of magnesium, which is 12, meaning it has 12 electrons in total.
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$.
Identify the electrons in the outermost shell (the 3rd shell), which are the \$3s^2$ electrons, so magnesium has 2 valence electrons.
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