zGmas practice milestones

Energy Level

The fixed distances from the nucleus of an atom where electrons reside.

Quantum number

A number that describes the energy level of an electron in an atom.

Valence Electrons

Electrons in the outermost energy level of an atom that are involved in bonding.

Ionization Energy

The energy required to remove an electron from an atom or ion.

Electronegativity

A measure of the tendency of an atom to attract a bonding pair of electrons.

Orbital

A region in an atom where there is a high probability of finding electrons.

Noble Gases

Elements in Group 18 of the periodic table that are generally unreactive due to their full valence shell.

Cation

A positively charged ion formed when an atom loses one or more electrons.

Anion

A negatively charged ion formed when an atom gains one or more electrons.

Periodic Law

The principle that the properties of elements are periodic functions of their atomic numbers.