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calcium calcium calcium
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atoms
proton
neutron
electron
element
atomic number (different for each element)
isotope
electron shell
valence shell
octet rule (generalizing - 2 e- in first shell, EIGHT in subsequent shells)
molecule – 2 or more atoms bonded together
compound – 2 or more DIFFERENT atoms bonded together
ionic bond
covalent bond
electronegativity
anion
cation
ionic compounds (aka 'salts')
polar nonpolar [+ and [- with respect to polar molecules
hydrogen bond