BIOL 2010 Lecture Notes - Lecture 2: Ionizing Radiation, Beta Particle, Covalent Bond
Document Summary
Chemistry of life: predominately made of 3 elements but even the trace of elements is important for normal physiology. Inorganic elements extracted from the soil by plants and then moved up from the food chain. Ca, p, cl, mg, k, na, s, i, fe, mn, zn, cu. Elements are made of atoms: and atoms are made of Number normally equals the number of protons. Weight of (cid:862)(cid:374)egligi(cid:271)le(cid:863: protons and neutrons found in the nucleus while electrons are found in orbits called shells. Bohr model of atoms is overly simplistic but it will work for us. Isotopes: cha(cid:374)gi(cid:374)g the (cid:374)u(cid:373)(cid:271)e(cid:396) of (cid:374)eut(cid:396)o(cid:374)s does(cid:374)"t affe(cid:272)t the (cid:271)o(cid:374)di(cid:374)g (cid:271)eha(cid:448)io(cid:396) of the atoms. Does affect their physical behavior and they may be unstable. It is the valence electrons that matter there. Radiation (the emission of energy as electromagnetic waves) Light, radio waves are all types of low energy radiation that do not cause harm.
