Multiple Choice
How many valence electrons does a bromine (Br) atom have?
2
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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 total valence electrons are present in a molecule of H_2O?
A
8
B
4
C
6
D
2
Verified step by step guidance1
Identify the atoms present in the molecule H_2O: there are 2 hydrogen (H) atoms and 1 oxygen (O) atom.
Determine the number of valence electrons for each type of atom. Hydrogen has 1 valence electron, and oxygen has 6 valence electrons.
Calculate the total valence electrons contributed by hydrogen atoms: multiply the number of hydrogen atoms by their valence electrons, which is $2 \times 1$.
Add the valence electrons from oxygen to the total from hydrogen: $6 + (2 \times 1)$.
Sum these values to find the total number of valence electrons in the H_2O molecule.
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