Multiple Choice
How many valence electrons does calcium (Ca) have?
3
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons are present in a neutral atom of nitrogen?
A
5
B
2
C
7
D
3
Verified step by step guidance1
Identify the element in question, which is nitrogen (N).
Determine the atomic number of nitrogen, which is 7. This means a neutral nitrogen atom has 7 electrons.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of nitrogen: $1s^2 2s^2 2p^3$.
Count the electrons in the outermost shell (the second shell): $2s^2$ and $2p^3$ add up to 5 valence electrons.
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