Answers

2016-03-25T07:30:26+05:30
Boron=valency3=B+ EC=1s2 2s2 2p1
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2016-03-25T08:40:16+05:30
X valency- 3
Sulphate valency- 2
To find the compund cross multiply their valency.
X2(SO4)3
Hope it helps. Best wishes. Cheers. :)
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