BIOL 1201 Lecture Notes - Lecture 1: Valence Electron, Bohr Model, Scientific Method
12 Oct 2014
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Document Summary
Scales biologists are interested in: (1) atomic- 10^-8 meters (2) community- 10^6 meters. Organisms are composed largely of 11 basic elements. The difference between the elements alone and the use of them in the human body is simply their structure. (sugar dissolves in water but not ethanol) Atom- smallest unit of matter separable by normal chemical means (or) smallest unit of matter that retains all properties of said elements. Atomic #- number of protons in an atom. Atomic mass- approximate number of protons and neutrons in an atom. Isotopes- variants of an atom, have different atomic mass (+/- neutrons) This model has electrons moving in orbitals or shells around the nucleus. The electrons always try to be in the lowest orbital or energy shell (that is closest to the nucleus). The lowest level (k), the next level (l) His next observation was that an atom was most stable (that is unreactive) when the outer most shell of electrons was full.
