Bio200chapter3

Bio200chapter3 - Chapter 3: The Chemistry of Life 3.1 Atoms...

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Chapter 3: The Chemistry of Life 3.1 Atoms Organisms are chemical machines must know chemistry to understand biology Any substance that has mass and occupies space is comprised of matter . all matter is made up of atoms . All atoms have the same structure at core is nucleus comprised of two subatomic particles protons (positively charged) neutrons (no charge) orbiting nucleus is cloud of other subatomic particles electrons (negatively charged) Atoms characterized by either: atomic number = number of protons . All atoms w/same atomic number are same element mass number = overall mass Number of protons + neutrons . Electrons determine chemical behavior of atoms Only parts that come close enough to each other in nature to interact Electrons are associated with energy . field of energy around atom arranged as levels called electron shells Within shells are orbitals (Rings) . Shells closer to nucleus have less energy Each shell has specific numbers of orbitals atoms with incomplete orbitals tend to be more reactive atoms lose, gain, or share electrons to fill outermost shell basis of chemical bonding 3.2 Ions and Isotopes Ions = atoms that have gained or lost electrons Isotopes = atoms w/same number of protons but different numbers of
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Bio200chapter3 - Chapter 3: The Chemistry of Life 3.1 Atoms...

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