Ionic Compounds definitions

Octet Rule
The tendency for atoms to gain or lose electrons in order to fill their s and p orbitals and become stable.
Ion
An atom or group of atoms (like a polyatomic ion) with a positive or negative charge.
Cation
A positively charged ion. Appears first in an ionic compound.
Anion
A negatively charged ion.  Appears last in an ionic compound.
Lattice energy

The energy given off when one mole of ions of an ionic compound form the crystal lattice.

This is also the amount of energy it takes to break one mole of bonds in a crystal lattice.

One mole of atoms is 6.022 x 1023 atoms.

Crystal lattice
The alternating cation & anion structure of an ionic compound.
Formula unit
The simplest ratio of the crystal lattice.
Isoelectronic
Having the same electron configuration as another atom or ion.  Usually this is discussed when an atom becomes an ion and achieves the electron configuration of a noble gas.
Electroneutrality
Having an equal number of positive and negative charges; therefore the compound is neutral.
Subscript

The number below an atoms symbol which designates how many atoms are in a compound.

 Ex: MgCl2

Superscript
The charge that follows an atom; it is raised. Cu+2
Polyatomic ion
A group of nonmetals that has gained or lost a(n) electron(s) and has a charge.
Binary Ionic Compound
Binary means two, so it’s a compound that contains exactly two elements, therefore no polyatomic ions. Ex MgCl2
Ionic compound (salt)
A compound consisting of cations and anions and held together by the attraction of the oppositely charged ions.
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