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Why is the configuration of electrons in an atom's outer shell important?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does hydrogen have?
A
0
B
8
C
1
D
2
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Recall that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Identify the electron configuration of hydrogen. Hydrogen has 1 electron, which occupies the first energy level (1s orbital).
Since the first energy level can hold up to 2 electrons, and hydrogen has only 1 electron, that single electron is in its valence shell.
Therefore, hydrogen has 1 valence electron because it has only one electron in its outermost (and only) shell.
This explains why the correct answer is 1 valence electron for hydrogen.
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