Biology Review

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Author:
jskunz
ID:
307405
Filename:
Biology Review
Updated:
2015-09-05 19:40:12
Tags:
bio
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Description:
review
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  1. ions
    formed when atoms lose or gain an electron
  2. atomic mass
    • the atomic weight
    • the combined mass of all particles in an atom
    • Protons and neutrons (electrons are small enough their mass isn't included )
    • Bottom number on the elements square in periodic table
  3. isotopes
    • Atoms which vary in the number of neutrons
    • recall that a neutral atom of a particular element has equal number of electrons and protons, so the + and - charges cancel out
    • The number of neutrons can vary, which changes the atom's mass by not chemical properties
  4. atomic number
    • number of protons
    • top number on the elements square in periodic table
  5. mass number
    sum of protons and neutrons

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