BISC 101 : BISC 101 LAB NOTES (Part 1)
20 Nov 2012
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Plant biology (2): leaves, flowers, fruits and seeds. Basic atomic and molecular chemistry: structure of the atom. All atoms have electrons ( charge particles) and protons (+) eg. h: 1 proton, 1 e- Atomic #: number of protons in atom. Electrons: move around nucleus in electron shells. Neutron: neutral particles in nucleus eg. he: 2 protons, 2 neutrons, 2 e- E- do not all occupy the same shell (recall n-shells, subshells, orbitals) # of e-: in any shell is given by 2n2 where n = shell # No more than 8 e- can be found in outermost shell of atom (octet rule) *periodic table on p. 26 of biological molecules . From k to kr, 3rd shell does not get 18 e- until n=4 is filling up (aufbau) Same group = same e- # in outer shell. Standard reference atom: carbon (6 p, 6 n, 6 e-) of weight 12 daltons.
