Multiple Choice
How many valence electrons are present in a molecule of NH_3 (ammonia)?
Table of contents
- 1. Intro to General Chemistry3h 48m
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- Magnetic Properties of Complex Ions: Octahedral Complexes11m
- 1. The Chemical World10m
10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does a chlorine atom have?
A
7
B
5
C
6
D
8
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Verified step by step guidance1
Identify the element in question, which is chlorine (Cl).
Determine the atomic number of chlorine, which is 17, meaning it has 17 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of chlorine: \$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{5}$.
Count the electrons in the outermost shell (the third shell): \$3s^{2} 3p^{5}$, which sums to 7 valence electrons.
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