Presentation on theme: "Chemistry Chapter 8 Notes #2. Ionic Bonding/terms Anions and cations are held together by opposite charges. Many ionic compounds are referred to as."— Presentation transcript:
Ionic Bonding/terms Anions 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.
Ionic Bonding Cation + Anion The cation is always written first Formula 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
Ionic Bonding NaCl The 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.
Ionic Bonding Na + Cl - Note: Remember that NO DOTS are now shown for the cation!
Ionic Bonding = Ca 3 P 2 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
Naming Compounds Name Cation first, anion second Monatomic cation – name of element Monatomic anions – drop ending, add –ide Ex. Oxygen = oxide Polyatomic ions = name of polyatomic Transition metals – the oxidation number is written as a roman numeral
Ionic Properties Ionic crystal = crystal lattice 3-dimensional geometric pattern of particles High melting points High boiling points Hard, rigid, and brittle Due to the high strength of the bonds Energy to separate ions (1 mole) = lattice energy