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Bio Lecture 3 - Bio Lecture 3 Ch 2 Chemical context of life...

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Bio Lecture 3 (9/7/11) Ch. 2 Chemical context of life Cellular processes consist of interactions between molecules These processes have to follow the rules of chemistry About 25 of the 92 elements are essential to life 96% is carbon, hydrogen, oxygen, nitrogen o H, O, N, are usually connected to carbon chains/skeletons Inner most shell can only hold 2 electrons, every other shell can hold 8 The valence shell determines the cells reactivity, if it is full, the element is stable (not looking to react) Potential energy of molecules is due to structure of molecules/atoms or location molecules/atoms- based on electrons position around nucleus The farther away from the nucleus the more potential energy an electron has The number of bonds an element can form equals the number of electrons needed to fill its valence shell Covalent bond: 2 atoms share a pair of valence electrons o the shared electrons count as part of each atoms valence shell to become stable
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