Counting Atoms

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What is an atom?

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An atom is the smallest unit of matter that retains the properties of an element.

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What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

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What is the difference between an element and a compound?

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An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

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How do you determine the number of atoms in a chemical formula?

Back

Count the subscripts in the formula; if there is no subscript, it is assumed to be 1.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

What is the chemical formula for water?

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Front

What is the total number of atoms in 4 molecules of water (4H2O)?

Back

There are 8 Hydrogen atoms and 4 Oxygen atoms, totaling 12 atoms.