Chemical Bonding and Periodic Trends

Periodic Trends Assignment for weekend; Identify the periodic trends for each of the following properties: Atomic radius density Boiling/melting point First ionization energy Electronegativity Be able to make comparisons!!!!!!!! By Monday!!

Using your notes… Larger atom: hydrogen or sodium Larger atom: nitrogen or florine Higher ionization energy: K or Cu Higher ionization energy: Ca or Ba Higher electronegativity: Be or O Higher electronegativity: O or Se Higher Density: Cs or Os Higher boiling point: S or Cl EC – highest electronegativity:, lowest ioniz. Energy

Using Periodic properties for bond predictions Metal to metal: Metal to non-metal Non-metal to non-metal (similar) Non-metal to non-metal (different) Electronegativity difference 0 < covalent .5 < polar covalent < 1.6 ionic (roughly)

Other Trends

Properties Favorite substance Favorite use Engineering techniques/production 

Using Dot Diagrams to predict bonding What is a Stable Electron Configuration?? FULLOREIGHT Using DOT diagrams to represent/predict bonding

Using Dot Diagrams to predict bonding Valence Shared Electron Pair Repulsion Model VSEPR Used to predict Molecular Shapes and there fore properties

Bonding Lab Work to fill out table Check book or internet for official names to the shapes of your compounds Be sure you can identify the central atom, if one, of each molecule BE SURE to clean table before you open bags!!!!!!!!!

Shapes Make a list of molecular shapes from Chapter 12 Sketch each shape in you notebook!!!

Bonding comparison TYPES: NPC PC I M Conductivity (solid and aqueous) Melting point, boiling point Solubility sodium chloride, sucrose, copper sulfate, glucose, starch, iron filings, manganese IV dioxide, charcoal Data table: substance, bond type, prediction/observation