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. Molecules can be made 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 in a fixed ratio.

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

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Count the different chemical symbols in the formula. Each unique symbol represents a different element.

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What does the subscript in a chemical formula indicate?

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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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What is the chemical formula for water?

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There are 24 atoms in total: 6 carbon (C), 12 hydrogen (H), and 6 oxygen (O) atoms.

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What is the chemical formula for a compound made of 1 nickel atom and 2 fluorine atoms?

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