Counting Atoms

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What is a molecule?

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A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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What is a compound?

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A compound is a substance formed when two or more different elements are chemically bonded together.

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What is the chemical formula for water?

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There are 3 atoms in one molecule of water: 2 hydrogen atoms and 1 oxygen atom.

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What does the subscript in a chemical formula indicate?

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The subscript in a chemical formula indicates the number of atoms of the element present in the molecule.

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What is the chemical formula for nickel fluoride?

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Which element is least likely to form a compound?

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Argon is least likely to form a compound because it is a noble gas and is chemically inert.

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