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atoms in ionic compounds
equal to ion’s charge
a molecule of one element (O2, Na)
0
H prefers
+1, -1 with metals
O
-2, -1 in peroxides, -0.5 in superoxides, positive with F
Cl
-1, positive with F
F
-1
Halogens
-1, positive with O, equal to charge of molecule or ion with another
atom in elemental state (Fe0, O2, Br2)
0