BIOL 1201 : Bio Exam 1 Study Guide
Document Summary
Bio 1201 exam 1 characteristics of living systems: > response to environment reductionist approach start small and work up(larger) atom smallest unit of an element; retains all of that element"s properties subatomic particles: Bohr model model of an atom with electron shells (k2, l8, m8) Valence number of electrons gained or lost (whichever is smaller) > ionic strong electrical attraction between ions: form when atoms completely gain and lose electrons, strongest when dry. > covalent electrical attraction where electrons are shared: strongest in water, covalent electrons shared equally, polar covalent electrons shared unequally, covalent/polar covalent scale: (when difference in electronegativity is ) Covalent < . 5 < polar covalent < 1. 7 < ionic. Electronegativity measure of attraction an atom has for electrons. > are not involved in making a substance. > hydrogen bonds very weak electrical attractions between atoms bearing partial electrical charge: one atom involved must be hydrogen.
