객관식
How many valence electrons does sulfur (S) have?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
객관식
How many valence electrons does silicon (Si) have?
A
2
B
4
C
8
D
6
검증된 단계별 안내1
Identify the element in question, which is silicon (Si).
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of silicon. Silicon has an atomic number of 14, so its electrons are arranged as: \$1s^2 2s^2 2p^6 3s^2 3p^2$.
Focus on the electrons in the highest energy level, which is the third shell (3s and 3p orbitals).
Count the electrons in the 3s and 3p orbitals: \$3s^2$ means 2 electrons, and \$3p^2$ means 2 electrons, so total valence electrons = 2 + 2 = 4.
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