BIOL BC 1502y Lecture Notes - Lecture 3: Nuclear Force, Salt, Electronegativity
25 Aug 2016
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Bc1502 intro to cell and molecular biology. Charge forces: protons are attracted to electrons, electrons repulse one another. Nuclear force: neutrons and protons are attracted to each other. Electrons organized into valence shell: valence outer shell of electrons, # of electrons in the valance shell determines the reactivity of an atom. Group (up to down) # of electrons in the valence shell. Period (left to right) # of shells. Chemical bonds describe the chemical linkages between atoms that lead to the formation of molecules. Chemical bonds are formed and broken by chemical reactions: in living organisms, these bonds are assisted by enzymes. Atoms really, really want full valence shells: atoms with one or two may not want to lose their valance electrons, atoms missing one or two may want to gain valence electrons, atoms can share valence electrons. Periodic table elements: metals, non-metals, metalloids. A bond between two atoms in which one has given electrons to another atom.
