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How many valence electrons are present in a molecule of CO_2?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does a neon (Ne) atom have?
A
8
B
6
C
2
D
10
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검증된 단계별 안내1
Identify the element in question, which is neon (Ne). Neon is a noble gas with atomic number 10.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of neon: 1s\^2 2s\^2 2p\^6.
Recognize that the first shell (1s) is full with 2 electrons and the second shell (2s and 2p) is the outermost shell with 8 electrons.
Conclude that the number of valence electrons in neon is the number of electrons in the outermost shell, which is 8.
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