1.5 Periodic Table/Elements Vocab

The smallest unit of an element that has all of the properties of that element. Contains 3 subatomic particles: protons, neutrons, electrons. 

• The Atom

• Nucleus

• Electrical Charge

• Proton

A property of matter that makes particles or objects attract or repel each other. A charge can be positive or negative. If something has no charge it is considered neutral. 

• The Atom

• Nucleus

• Electrical Charge

• Proton

The tiny, very dense, positively charged region in the center of an atom; made up of protons and neutrons. Contains all of the mass of the atom.

• The Atom

• Nucleus

• Electrical Charge

• Proton

A positively charged subatomic particle in the nucleus of an atom that contributes to the mass of the atom.

• The Atom

• Nucleus

• Electrical Charge

• Proton

A negatively charged subatomic particle found outside the nucleus; involved in the formation of chemical bonds. Considered weightless.

• Neutron

• Electron

• Atomic Number

• Atomic Mass

• isotopes

A subatomic particle in the nucleus of an atom that is without charge and contributes to the mass of an atom.

• Neutron

• Electron

• Atomic Number

• Atomic Mass

• isotopes

Elements that have the same number of protons but differing numbers of neutrons. Still the same element.

• Neutron

• Electron

• Atomic Number

• Atomic Mass

• isotopes

The average mass of an atom of an element. It is generally found at the bottom of the periodic square.

• Neutron

• Electron

• Atomic Number

• Atomic Mass

• isotopes

The number of protons found in the nucleus of an element. Usually at the top of the periodic square.

• Neutron

• Electron

• Atomic Number

• Atomic Mass

• isotopes

A charged atom where the proton number is no longer equal to the electron number. Formed when neutral atoms gain or lose electrons. 

• Mass Number

• Bohr Model

• ion