Atomic Structure and Periodic Table Review

Horizontal column that shows the number of energy levels of an element

Negative particles outside the nucleus

Average number of protons and neutrons in the nucleus of all the atoms that exist.

Positive particles in the nucleus

Vertical column on the periodic table.  Identifies valence electrons

Very small particles that make up other subatomic particles in the nucleus.

Organized arrangement of the elements

Atoms of the same element that have a different number of neutrons.

Symbol and valence electrons

Neutral particles in the nucleus

Number of protons in an atom.  Identifies the element.

Number of protons and neutrons in the nucleus