Multiple Choice
How many valence electrons does krypton (Kr) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does a neutral atom of boron have?
A
2
B
4
C
5
D
3
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Verified step by step guidance1
Identify the element in question, which is boron (B).
Determine the atomic number of boron, which is 5. This means a neutral boron atom has 5 electrons.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of boron: \$1s^2 2s^2 2p^1$.
Count the electrons in the outermost shell (the second shell): \$2s^2$ and \$2p^1$ add up to 3 valence electrons.
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