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

• Photon

• Electron

• Proton

• Neutron

A subatomic particle that has a negative charge.

• Neutron

• Proton

• Megaton

• Electron

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

• Neutron

• Proton

• Electron

• Photon

Atomic number

• Total number of protons, neutrons and electrons in an atom

• Number of electrons in the valence shell

• Total number of protons and neutrons in an atom

• The number of protons in the nucleus of an atom

The number of protons and neutrons in an atom

• Atomic number

• Atomic mass

• Valence shell

• Configuration

How do you calculate the number of neutrons of an element?

• Atomic Mass = Atomic number - Neutrons

• Atomic Mass - Atomic number = Neutrons

• Atomic number = Neutrons

• Atomic mass = Neutrons

What is a valence electron?

• An electron in the second electron shell

• An electron in the outermost electron shell

• The atomic number

• An electron in the innermost electron shell

Period -

• Elements that occur in vertical columns on the periodic table

• A horizontal row of elements in the periodic table

• Found in Group 2 of the periodic table; highly reactive

• The outermost shell of an atom

Elements that occur in vertical columns on the periodic table.

• Atomic mass

• Atomic number

• Groups

• Period

Elements in the same group or family have the same number of

• neutrons

• valence electrons

• electrons

• energy levels