1. Daily Science Name the following compounds that contain a TRANSITION METAL:  Zn 2 O 3  ZrF 2  CuN

2. PG. 53 Metallic and Covalent Bonds

3. Metallic Bonds Between a metal and a metal Outer energy levels form a ‘sea of electrons’ High melting and boiling points Good conductors Can make alloys (mixture of elements that have metallic properties) Ex. Brass and bronze

4. Covalent Bonds Non-metal and non-metal Valence electrons are shared Form molecules (2 or more atoms covalently bonded) Use Lewis Structures to show covalent bonds

5. Lewis Structures and Covalent Bonding The shared electrons are called bonding pairs Unshared electrons are called lone pairs Single bonds in a Lewis structure are called sigma bonds (σ) Double and triple bonds are called pi bonds (π) When bonds are broken they either release energy or take in energy  Exothermic- energy is released (feel heat)  Endothermic- Energy is absorbed ( feels cold)

6. Naming Covalent Bonds Name the first element first using the whole name  If there is only one of the element name is regularly  If there is more than one of the element use a prefix The second element ALWAYS gets a prefix and the ending drops and you add –ide Neither one is capitalized

7. Number of atomsPrefix 1mono- 2di- 3tri- 4tetra- 5penta- 6hexa- 7hepta- 8octa- 9nona- 10deca-

8. Examples CCl 4 As 2 O 3 CO SO 2 NF 3

9. Naming Acids Always has a Hydrogen attached to it and is always dissolved in water Naming binary acids:  Only 2 elements  Has a hydrogen atom  Hydro- element or polyatomic ion- ic acid Naming oxyacids:  A polyatomic ion that contains an oxygen  If the ion ends in –ate change it to –ic  If the ion ends in –ite change it to –ous

10. Examples HBr HCN HNO 3 HNO 2