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Which method can be used to determine the number of valence electrons in an atom of a representative element?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a hydrogen atom have?
A
0
B
2
C
8
D
1
Guida verificata passo dopo passo1
Recall that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Identify the electron configuration of a hydrogen atom, which has only one electron.
Since hydrogen's only electron is in the first shell (1s orbital), this electron is also its valence electron.
Recognize that the first shell can hold up to 2 electrons, but hydrogen only has 1 electron in that shell.
Therefore, the number of valence electrons in a hydrogen atom is 1.
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