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How many valence electrons are present in a molecule of NH_3 (ammonia)?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a chlorine atom have?
A
7
B
5
C
6
D
8
Guida verificata passo dopo passo1
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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