BIOL 1020 Lecture Notes - Lecture 1: Unified Atomic Mass Unit, Electronegativity

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BIOL 1020 Full Course Notes
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BIOL 1020 Full Course Notes
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Element: 92 elements, pure substances, 96% of living things have c, h, o, n. Pure" or in a molecule: na - explosive, cl - toxic gas, nacl - table salt = molecule. Trace elements: in small amounts, important, example. Zn & i: needed in the human body in trace amounts. Atomic number: # protons, # protons = # electrons in a neutral atom. Atomic mass (weight: # protons + # neutrons, protons = 1 amu (dalton, neutrons = 1 amu (dalton, electrons = 0 mass. Isotopes: di erent atoms of the same element, di er in # neutrons, some isotopes are radioactive. Time it takes for half of the atoms to decay/change form. Electrons: same mass = 0, same charge = , di er in energy, electrons determine reactivity by its position. #2: energy increases the further away the electron is from the nucleus.

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