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. It consists of a nucleus made of protons and neutrons, surrounded by electrons.

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What is a molecule?

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A molecule is a group of two or more atoms bonded together. It can consist of the same or different elements.

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

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Count the number of each type of atom represented in the formula. The subscript indicates the number of atoms of that element.

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What does the subscript in a chemical formula represent?

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The subscript indicates the number of atoms of the element that precedes it in the chemical formula.

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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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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 with a full outer electron shell.

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What is the chemical formula for water?

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