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How many valence electrons does a sulfur (S) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does an atom of boron (B) possess?
A
5
B
4
C
3
D
2
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Identify the atomic number of boron (B), which is 5. This means boron has 5 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of boron: 1s\^2 2s\^2 2p\^1.
Recognize that the first shell (1s) is full with 2 electrons and does not count as valence electrons.
Count the electrons in the second shell (2s and 2p orbitals), which are 2 + 1 = 3 valence electrons.
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