Multiple Choice
For the ion Fe^{2+}, how many electrons are present in its valence d orbitals?
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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 CO_2?
A
24
B
16
C
20
D
18
Verified step by step guidance1
Identify the number of valence electrons for each atom in the molecule. Carbon (C) is in group 14 and has 4 valence electrons, while oxygen (O) is in group 16 and has 6 valence electrons.
Determine the total number of valence electrons by adding the valence electrons from all atoms in the molecule. Since CO_2 has one carbon atom and two oxygen atoms, calculate the sum as: $4 + 2 \times 6$.
Perform the multiplication first: $2 \times 6 = 12$ valence electrons from oxygen atoms.
Add the valence electrons from carbon and oxygen: $4 + 12$ to get the total valence electrons in the CO_2 molecule.
The result from the addition gives the total number of valence electrons present in the CO_2 molecule.
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