Chemistry Vocabulary #2

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Nucleus

Back

The center of an atom, formed by protons and neutrons.

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Protons

Back

A positive subatomic particle found in the nucleus of an atom.

Front

Electrons

Back

A negatively charged subatomic particle found outside of the nucleus of the atom.

Front

Neutrons

Back

A subatomic particle found in the atom's nucleus with no charge (neutral).

Front

Atomic mass

Back

The average mass of a typical atom of that element. Is the sum of all protons and neutrons.

Front

Period

Back

A row of elements across the periodic table.

Front

Group or family

Back

A column of elements in the periodic table. Groups of elements have similar physical and chemical properties.

Front

Reactivity

Back

The tendency of a substance to undergo chemical changes.

Front

Atomic number

Back

Number of protons in the nucleus which gives the identity of the element.

Front

Metals

Back

Elements with similar properties found on the left side of the “staircase” on the periodic table.