311C F07 L3OL - Chemistry of Life Chapter 2 Organisms are...

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Chemistry of Life Chapter 2
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Organisms are composed of matter Matter: Has mass, takes up space Element: A substance that cannot be broken down to another substance by chemical reactions Properties depend on structure of its atoms
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Periodic Table of the Elements
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Elements C, H, O, N
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Atoms The smallest unit of an element that still retains its distinctive chemical properties Composed of subatomic particles Protons – positive+ charge, in the nucleus, weight: 1 dalton Neutrons – no charge, 1 dalton, in the nucleus Electrons – negative- charge, negligible mass, cloud around nucleus Differ due to different numbers of subatomic particles Atomic number Unique to each element. Identical to number of protons Mass number #P+N Approximation of atomic mass Not always the same for an element. Mass number – Atomic number = #e-
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Atom Models
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Atoms Atomic Number Mass Number
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Isotopes Atoms of a given element may occur in different forms Differ in the number of neutrons Same number of protons!
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