Multiple Choice
How many valence electrons does a chlorine (Cl) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many total valence electrons are present in one molecule of SO2?
A
16
B
20
C
12
D
18
Verified step by step guidance1
Identify the atoms present in the molecule SO2: one sulfur (S) atom and two oxygen (O) atoms.
Determine the number of valence electrons for each atom based on their group in the periodic table. Sulfur is in group 16, so it has 6 valence electrons. Oxygen is also in group 16, so each oxygen atom has 6 valence electrons.
Calculate the total valence electrons by adding the valence electrons of sulfur and the two oxygen atoms: total valence electrons = valence electrons of S + 2 × valence electrons of O.
Write the equation for the total valence electrons: total valence electrons = 6 + 2 \times 6.
Sum the values to find the total number of valence electrons in one molecule of SO2.
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