1Chapter 03Molecules, Compounds, and Chemical EquationsElements and CompoundsElements – cannot be broken down furtherElementsSome elements exist as diatomic molecules. H2O2N2F2Cl2Br2and I2Other elements occur as polyatomic moleculesP4S8Se8
has intentionally blurred sections.
Sign up to view the full version.
2ElementsCompoundsCompounds are held together by chemical bonds.There are two types of chemical bonds– Ionic Bonds-attraction between oppositely charged ions. Molecules are not formed. (crystal lattice)– Covalent Bonds-sharing of electrons between the two valence shells. Molecules are formedIn both cases the driving force is the noble gas configuration – we will talk about this laterIonic vs. Molecular CompoundsPropane – contains individual C3H8moleculesTable salt – containsan array of Na+ionsand Cl-ions