Multiple Choice
What is the valence electron configuration for the argon atom?
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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 molecule of NH_3 (ammonia)?
A
11
B
5
C
8
D
6
Verified step by step guidance1
Identify the atoms present in the molecule NH_3: one nitrogen (N) atom and three hydrogen (H) atoms.
Determine the number of valence electrons for each type of atom. Nitrogen is in group 15 of the periodic table, so it has 5 valence electrons. Hydrogen is in group 1, so each hydrogen atom has 1 valence electron.
Calculate the total valence electrons contributed by the hydrogen atoms by multiplying the number of hydrogen atoms by their valence electrons: $3 \times 1$.
Add the valence electrons from nitrogen and hydrogen atoms together to find the total valence electrons in the NH_3 molecule: $5 + (3 \times 1)$.
The sum obtained represents the total number of valence electrons available for bonding and lone pairs in the ammonia molecule.
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