Periodic Table & Atoms Vocabulary

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atom

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The basic building blocks of matter and consists of subatomic particles (proton, neutron, and electron)

Tags

NGSS.MS-PS1-1

Front

atomic mass

Back

The sum of the protons and neutrons in an atom

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atomic number

Back

Number of protons in the nucleus

Front

chemical formula

Back

Tells which elements are in a compound and their ratios

Tags

NGSS.MS-PS1-1

Front

chemically stable

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Outer energy level is filled with electrons

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chemical symbol

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An abbreviated way to write an element’s name

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compound

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A substance made of two or more elements that are chemically combined

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density

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Mass per unit of volume of a material

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electron

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Subatomic particle in an atom that is negatively charged and occupies the energy levels in an atom

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Front

electron cloud (Quantum Mechanics)

Back

Electrons do not follow fixed orbits but tend to occur more frequently in energy levels around the nucleus at any given time