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How many valence electrons does a potassium (K) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does a carbon atom have?
A
2
B
8
C
6
D
4
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검증된 단계별 안내1
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom that participate in chemical bonding.
Determine the electron configuration of a carbon atom. Carbon has an atomic number of 6, so it has 6 electrons.
Write the electron configuration: \$1s^2 2s^2 2p^2$.
Identify the electrons in the outermost shell, which is the second shell (n=2) for carbon. These are the \$2s^2\( and \)2p^2$ electrons.
Add the electrons in the outermost shell: \(2 + 2 = 4\) valence electrons.
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