객관식
In introductory chemistry, the chemical behavior (reactivity) of an atom is determined primarily by which of the following?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
Multiple Choice
How many valence electrons does a nitrogen atom have?
A
8
B
3
C
7
D
5
검증된 단계별 안내1
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom that participate in chemical bonding.
Determine the atomic number of nitrogen, which is 7. This means a nitrogen atom has 7 electrons in total.
Write the electron configuration of nitrogen to see how these 7 electrons are distributed among the shells: \$1s^2 2s^2 2p^3$.
Identify the outermost shell, which is the second shell (n=2) containing the \$2s\( and \)2p$ orbitals.
Count the electrons in the outermost shell: \(2\) electrons in \$2s\( and \(3\) electrons in \)2p$, totaling \(5\) valence electrons.
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