write the valency of each cation in the following compounds
(1.)NaCl
(2.)Na2CO3
(3.)MgSO4
(4.)CaCl2
(5.)Al2(SO4)3
(6.)(NH4)2SO4
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Answer:
Na - +1
Mg - +2
Ca - +2
Al - +3
NH4 - +1
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