BIOL 1001 Chapter : Chapter 2 Biology

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15 Mar 2019
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Common elements in living organisms: oxygen (o) make up 96, carbon (c) total , hydrogen(h) building blocks of, nitrogen (n) life. Periodic table of elements: organizes elements by, atomic number = # of protons in an atom, ex. Hydrogen: 1 proton = atomic # is 1: ex. Carbon: 6 protons = atomic # is 6: chemical properties, gas, liquid, solid, each element also has, unique chemical symbol, atomic mass (not always on table)- total mass of protons, neutrons and electrons. Isotopes: atoms of same element that vary in # of neutrons, most are stable, some are radioactive, nuclei spontaneously break apart, release energy, uses: carbon dating, studying biological processes, diagnostic tests, ex. Positron emission tomography (pet scan: detects brain tumors using radioactive fluorine, tumor cells emit high levels of energy hot spot on image. Inert vs. reactive atoms: inert atoms, full valence shell, will not react with other atoms, ex.

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