Multiple Choice
Where are neutrons located in an atom?
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2. Atoms & Elements
The Atom
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Which of the following combinations of atoms makes up a molecule of water?
A
One hydrogen atom and two oxygen atoms
B
Two hydrogen atoms and one oxygen atom
C
Two oxygen atoms and two hydrogen atoms
D
One hydrogen atom and one oxygen atom
Verified step by step guidance1
Recall the chemical formula of water, which is H\_2O. This means each water molecule consists of 2 hydrogen atoms and 1 oxygen atom.
Analyze each option by comparing the number of hydrogen and oxygen atoms to the formula H\_2O.
Option 1: One hydrogen atom and two oxygen atoms corresponds to H O\_2, which is not water.
Option 2: Two hydrogen atoms and one oxygen atom corresponds exactly to H\_2O, which matches the water molecule.
Option 3: Two oxygen atoms and two hydrogen atoms corresponds to H\_2O\_2, which is hydrogen peroxide, not water; Option 4: One hydrogen atom and one oxygen atom corresponds to HO, which is not water.
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