Periodic Table

Electrons on the outermost energy level of an atom

• Valence Electrons

• Elements

• Mass Number

• Element symbol

A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.

• Atom

• Protons

• Electrons

• Elements

The sum of the number of neutrons and protons in an atomic nucleus

• atomic number

• Atomic mass

• Nuetrons

• Protons

the abbreviation of an elements name; 1 or 2 letters, first letter is always capitalized, second is never capitalized

• Atomic mass

• atomic number

• Element symbol

• Periodic Groups

The number of protons in an atom which uniquely identifies an element

• Elements symbol

• Atomic Number

• Atomic mass

• protons

The basic particle from which all elements are made

• Atom

• Atomic number

• Electron

• Proton

Positively charged subatomic particles found in the atomic nucleus.

• Protons

• Neutrons

• Electrons

• ions

Negatively charged subatomic particles.

• Protons

• Electrons

• Neutrons

• ions

The subatomic particles located in the nucleus that have no charge

• Neutrons

• Protons

• electrons

• positrons

Vertical columns on the periodic table

• Groups

• Halogens

• Gases

• Periods