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in order to write the formula of a compound you will need to know the symbols of the ions
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hydrogen
H+
silver
Ag+
lithium
Li+
iron(III)
Fe3+
aluminium
Al3+
sodium
Na+
potassium
K+
barium
Ba2+
lead
Pb2+
fluoride
F-
sulfate
(SO4)2-
nitrate
(NO3)-
hydrogencarbonate
(HCO3)-
sulfide
S2-
nitride
N3-
bromide
Br-
magnesium
Mg2+
copper(II)
Cu2+
iodide
I-
oxide
O2-
iron(II)
Fe2+
carbonate
(CO3)2-
zinc
Zn2+
hydride
H-
calcium
Ca2+
chloride
Cl-
ammonium
(NH4)+
hydroxide
OH-