BSC 2010C Lecture Notes - Lecture 2: Nonmetal, Ionic Bonding, Hydrogen Bond
Document Summary
Chap 2: chemical context of life: elements. 4 elements: h, o, n, c makes up 96% of living matter: bonding. Octet rule: h needs 2e, the rest need 8e -> stability. Covalent bond: sharing electron (e) pairs btw nonmetal atoms/ions. + polar: unequally shared e, charged, 1 atom is more electronegative. Ionic bond: complete transfer of valence e btw metal & nonmetal atoms. Hydrogen bond: h atoms bond covalently 2 electronegative atoms, attracted 2 another electronegative atoms. H2o: btw atoms: polar covalent, btw molecules: h2 bond.
