BIOL 205 Lecture Notes - Lecture 2: Electron Shell, Atomic Mass, Atomic Number
24 Oct 2018
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Document Summary
Iron necessary component of hemoglobin: carries oxygen in blood. Ionic: one atom donates an electron from its outermost electron shell to the outermost elytron shell of another atom, both atoms lose the balance in charge between all of their protons and electrons. Ions: charged particles or charged molecule, the difference in charge holds them together in an ionic bond, covalent, atoms share one or more pairs of outer shell electrons. Important in solution of ions in water: hydrogen bonds important in 3-d structures of proteins, Dna: cohesion, effect of hydrogen bonds between large number of water molecules, permits capillary effect: Important in moving water through plants: produces surface tension. Important at small scales: helps produce viscosity of water. Ice: establishment of stable hydrogen bonds between water molecules during freezing olds them further apart than when they are in liquid state, thus occupies larger volume than equivalent mass of water, floats.
