BIO 121 Chapter 2: Chapter 2_ The Chemical Context of Life(Outline) (2)

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17 Feb 2019
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* matter: anything that takes up space and has mass. * element: a substance that cannot be broken down to another substance by a chemical reactions. * compound: a substance consisting of two or more different elements combined in a fixed ratio. * out of 92 natural elements 20-25% are essential for organisms to live healthy and reproduce. * oxygen, corbon, hydrogen, nitrogen, make up 96% of living matter. * trace elements: required by organisms in only minute quantities. * element"s properties depend on the structure of its atoms. * atom: the smallest unit of matter that still remains the properties of an element. * proton are positive and electrons are negative. * atomic nucleus is where protons and neutrons are. * dalton: unit of measurement for atoms and subatomic particles. * atomic number: the number of protons in an element. * mass number: number of protons and neutrons. * atomic mass: total mass of an atom.

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