U1: Atomic Structure, Bonding, and Attraction Vocabulary List

Front

Protons

Back

It is a positively charged subatomic particle found in the nucleus with virtually the same mass as a neutron. It determines the identity of the element.

Front

Neutron

Back

It is a subatomic particle found in the nucleus with no charge. Its mass is virtually the same as a proton.

Front

Ions

Back

atoms that have lost or gained electrons

Front

Mass Number

Back

the number of protons and number of neutrons added together

Front

Isotopes

Back

These are atoms of the same element with different masses. They have the same number of protons, but different numbers of neutrons.

Front

Relative Atomic Mass

Back

the weighted average of the masses of isotopes accounting for their different percentage abundance

Front

Orbital

Back

a region in space where electrons are most likely to be found

Front

Energy Level/Energy Shell

Back

The energy of the orbital that the electron occupies. It can be thought of as fixed distances from the nucleus where electrons are likely to be found.

Front

Octet Rule

Back

Every atom (except He) is surrounded by eight electrons.

Front

Valence Electrons

Back

Electrons in the last energy level/energy shell