[BIOL 103] - Final Exam Guide - Ultimate 43 pages long Study Guide!
29 Mar 2017
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Atom- basic unit of matter, composed of protons, neutrons, and electrons. Proton-- positively charged, nucleus, # of protons determines identity of atom. Atomic mass = # of protons + # of neutrons. Element- contains only one type of atom, smallest unit that can not be broken down any further by the methods of chemistry. Isotope- atoms of the same element with different numbers of neutrons (atomic mass) Isomers- molecules with the same chemical formula but different structures. Orbital- region where an electron is present most of the time; the maximum number of electrons in an orbital is 2. Molecules tend to be most stable when they share enough electrons to fill the outer shell. We only care about a few elements -> carbon, oxygen, hydrogen, nitrogen, phosphorous, and sulfur. Column indicates # of valence electrons (electrons in outside orbitals) Molecule- substance made up of one or more atoms, held together with a chemical bond.
