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Which of the following is the smallest unit of an element that retains its chemical properties?
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2. Atoms & Elements
The Atom
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How many atoms are present in a molecule of hydrogen (H_2)?
A
2
B
3
C
4
D
1
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Identify the molecular formula of hydrogen gas, which is given as H_2. This means each molecule consists of hydrogen atoms bonded together.
Understand that the subscript '2' in H_2 indicates the number of hydrogen atoms in one molecule of hydrogen gas.
Recall that the subscript in a chemical formula tells you how many atoms of that element are present in one molecule.
Since the formula is H_2, it means there are 2 hydrogen atoms in one molecule of hydrogen gas.
Therefore, the number of atoms present in a molecule of hydrogen (H_2) is 2.
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