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How many valence electrons does a neutral fluorine atom have?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
Multiple Choice
How many valence electrons does sodium (Na) have?
A
8
B
1
C
7
D
2
검증된 단계별 안내1
Identify the element in question, which is sodium (Na).
Recall that the number of valence electrons corresponds to the electrons in the outermost shell of an atom.
Determine the electron configuration of sodium. Sodium has an atomic number of 11, so it has 11 electrons.
Write the electron configuration for sodium: \$1s^{2} 2s^{2} 2p^{6} 3s^{1}$.
From the electron configuration, observe that the outermost shell (the third shell) has 1 electron, so sodium has 1 valence electron.
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