Chemistry Benchmark Vocabulary

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Reactant

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A substance on the left-hand side of an arrow in a chemical equation that undergoes a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Atomic Mass

Back

The total number of protons and neutrons in an atom.

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Atomic Number

Back

The number of protons in an atom.

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Neutrons

Back

Neutral particles in an atom.

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Halogens

Back

Group 17 elements that have 7 valence electrons.

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Protons

Back

Positively charged particles in an atom.

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Electrons

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

Chemical Equation

Back

A representation of a chemical reaction using symbols and formulas.

Tags

NGSS.MS-PS1-1

Front

Valence Electrons

Back

Electrons in the outermost shell of an atom that determine its chemical properties.

Front

Ionic Bond

Back

A chemical bond formed between two ions with opposite charges.