Periodic Table Vocab

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Atom

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The smallest particle of an element; made of electrons, protons, and neutrons.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

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Atomic Mass

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The mass of an atom, approximately equal to the number of protons and neutrons.

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Bond: Forms of electrostatic attraction holding atoms together.

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Any of several forms of electrostatic attraction between atoms that hold the atoms together.

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NGSS.HS-PS2-4

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Chemical Property

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A characteristic observed/measured when atoms rearrange during a chemical change.

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NGSS.MS-PS1-2

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Electron

Back

Negatively charged subatomic particle in the electron cloud; involved in chemical bonds.

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NGSS.MS-PS1-5

NGSS.MS-PS2-3

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Element: A pure substance made of the same type of atom.

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Groups: Columns in a periodic table that arrange elements by outermost shell electrons (families).

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Columns in a periodic table that arrange elements by the number of outermost shell electrons; also called families.

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Molecule

Back

Simplest unit of a chemical compound formed by two or more atoms joining chemically.

Tags

NGSS.MS-PS1-1

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Neutron

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A neutrally charged subatomic particle in the nucleus; contributes to atomic mass.

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Periodic Table of Elements

Back

A table of known elements arranged by properties, represented by chemical symbols.