Periodic Table Module I

The small, central (center) core of an atom.

• nucleus

• nucleolus

• proton

• electron

A subatomic particle that has a positive charge, found in the nucleus of an atom.

• electron

• proton

• neutron

• cloud

A subatomic particle that has no charge, found in the nucleus of an atom.

• proton

• electron

• neutron

• nucleus

A subatomic particle that has a negative charge.

• proton

• neutron

• electron

• nucleus

The number of protons in an atom.

• mass number

• atomic number

• electrons

• neutrons

An atom with the same number of protons and a different number of neutrons.

• atomic number

• mass number

• chemical symbol

• isotope

The sum of protons and neutrons.

• atomic number

• mass number

• atomic mass

• chemical symbol

The average mass of all the isotopes of an element.

• mass number

• atomic number

• atomic mass

• element name

A chart of the elements showing the repeating pattern of their properties.

• periodic table (of elements)

• periodic table (of substances)

• periodic table (of protons)

• periodic table (of neutrons)

A one or two letter representation of an element.

• chemical name

• chemical symbol

• element name

• mass number