2Ionic Bonding/termsAnions and cations are held together by opposite charges.Many ionic compounds are referred to as salts or oxides.Simplest ratio of elements in an ionic compound is called the formula unit.The bond is formed through the transfer of electrons.Electrons are transferred to achieve noble gas configuration.
3Ionic Bonding Cation + Anion Formula Units (instead of molecules) The cation is always written firstFormula Units (instead of molecules)The ions come together to neutralize the charge (always have an overall charge of zero)Structure: Positive ions are surrounded by negatives and vice versa
4Ionic BondingNaClThe metal (sodium) tends to lose its one electron from the outer level.The nonmetal (chlorine) needs to gain one more to fill its outer level, and will accept the one electron that sodium is going to lose.
5Ionic BondingNa+Cl -Note: Remember that NO DOTS are now shown for the cation!
17= Ca3P2 Ionic Bonding Formula Unit This is a chemical formula, which shows the kinds and numbers of atoms in the smallest representative particle of the substance.For an ionic compound, the smallest representative particle is called a: Formula Unit
18Naming Compounds Name Cation first, anion second Monatomic cation – name of elementMonatomic anions – drop ending, add –ideEx. Oxygen = oxidePolyatomic ions = name of polyatomicTransition metals – the oxidation number is written as a roman numeral
20Ionic Properties Ionic crystal = crystal lattice High melting points 3-dimensional geometric pattern of particlesHigh melting pointsHigh boiling pointsHard, rigid, and brittleDue to the high strength of the bondsEnergy to separate ions (1 mole) = lattice energy