BioNotes - Chemistry of Life Atoms Atom The basic unit of...

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Chemistry of Life: Atoms Atom: The basic unit of matter contains electrons(-), protons(+), neutrons(no charge) number of protons and electrons is same and unique for each element H = 1 proton, C = 6 protons, O = 8 protons. This is also the atomic number. Ions Some atoms lose or gain electrons, become charged ions Examples: Na Na+; Cl Cl- Elements of Life Element = substance makes up of only one kind of atom 92 naturally occurring elements “abundance on earth’s crust is not mirrored in living tissue” - Some of earth’s major elements are not found in cells (ex: Aluminum) - Some major elements in cells are not abundant on earth’s crush (Carbon) About 25 elements found in cells Can be identified as Macro and Micro elements Macro-elements: (Chris HOPKINS CaFe Mighty good) these are the elements that are needed and found in abundance in living things Photosynthesis: 6H2O+6CO2 > C6H12O6… Respiration: … Micro-elements calcium for bone silicon for glassy shell in certain protests potassium and Sodium for nerve conduction in animals Water Polarity Water is a polar molecule It is held together by H-Bonds, which is a type of polar covalent bond.
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This note was uploaded on 05/23/2008 for the course BIOL 1005 taught by Professor Mvlipscomb during the Summer '07 term at Virginia Tech.

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BioNotes - Chemistry of Life Atoms Atom The basic unit of...

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