O → group 6A → -2 charge
Ca → group 2A → +2 charge
SO42- → polyatomic ion → -2 charge
Na → group 1A → +1 charge
K → group 1A → +1 charge
ClO4- → polyatomic ion → -1 charge
Give the charges of the cation in each of the following compounds CaO, Na2SO4, KClO4, Fe (NO3) 2, Cr (OH) 3.
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What scientific concept do you need to know in order to solve this problem?
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