Chemistry H Chapter 7, section 1 and 2

Cation

A positively charged ion

Anion

A negative charged ion

Polyvalent Metals

Metals with more than one oxidation state (charge)

Polyatomic ions

A charged group of covalently bonded ions that behaves as a single bonded unit

Binary compound

A compound that contains TWO elements

Ternary compound

A compound that contains THREE elements

Ionic compound

A combination of positive cations and negative anions. Exist in nature as large crystals made up of many formula units. Are represented by formula units

Formula unit

The lowest whole number ratio of ions in an ionic compound

Oxidation number

A number that represent the total amount of electrons an atoms gains or loses to form a chemical bond.

Hydrates

A compound in which there’s a specific ratio of water molecules to formula unit of ionic compounds

Allotropes

Molecules of a single element that differs in molecule structure.

Hygroscopic

A hydrate that absorbs enough H2O from the air

Anhydrous

Without water

Deliquescent

A hydrate that absorbs enough air to become a solution