Counting Atoms

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What is an element in chemistry?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms that have the same number of protons.

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

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Count the different capital letters in the formula. Each capital letter represents a different element.

Front

What does a subscript in a chemical formula indicate?

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What is the chemical formula for 1 atom of Nickel and 2 atoms of Fluorine?

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Which element is least likely to form a compound: Hydrogen, Sodium, Argon, or Potassium?

Back

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

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

Back

Add up all the atoms represented in the formula, including those indicated by subscripts.

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What is the difference between an atom and a molecule?

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An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

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What does it mean if a chemical formula has no subscript next to an element?

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If there is no subscript next to an element, it means there is only 1 atom of that element in the molecule.