Answer:
Step-by-step explanation:
Criss Cross charges for the formula
No need to write 1 if there is a negative 1 or positive 1 charge
NO NEGATIVES in formula ONLY POSITIVE
The 2s cancel each other out same if it was both +4 and -4
Barium Chloride
Barium Oxide
Barium Iodide
Barium Sulfate
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