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chemical bond
when two or more atoms combine
octet rule
chemical theory that states that atoms tend to combine in such a way that they each have 8 electrons in their valence shells
valence electrons
only electrons in the outer shell; form chemical bonds
ionic bond
one atom donates electrons, the other accepts. Occurs between metal and nonmetal ions
covalent bond
two atoms share electrons between them. Occurs between two nonmetals
metallic bond
atoms are connected by a “sea of electrons”, only occurs between metals
Note 
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