notes 1-21 - Chemical Building Blocks & Chemical Bonds...

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Atom : the smallest chemical unit of matter Matter composed of one kind of atom is called an element When two or more atoms combine chemically, they form a molecule Molecules are made up of atoms of two or more elements called compounds o Compound: always 2 different atoms o Molecule: can be the same or different (All compounds are molecules. All molecules are NOT compounds.) The Structure of Atoms Table 2.1 Table 2.3 Structure of Four Biologically Important Atoms Fig. 2.1 Atomic Number: the number of protons of a particular element Atomic mass (wt)= P+N+E Mass Number= P+N -almost the same thing b/c E has almost no weight Ex: atomic mass of O=16 (not 24; not 8+8+8; 8*1.007+8*1.008+8*.0005) Ion : a charged atom produced when an atom gains or losses one or more electrons Cation: positively charged ion Anion: negatively charged ion *Atoms are always neutral (they have the same # of protons and electrons) -may have a different number of neutrons (=isotopes)
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This note was uploaded on 02/24/2011 for the course BIO 250 taught by Professor Datt during the Spring '09 term at South Carolina.

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notes 1-21 - Chemical Building Blocks & Chemical Bonds...

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