Answers

2015-10-31T15:18:08+05:30
there are two types of chemical combination 
1: electrovalent ( ionic ) combination
2: covalent combination
    ( a ) ordinary covalent combination
    ( b ) co - ordinate covalent combination
i hope that this will help u..........................^_^

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2015-10-31T19:23:49+05:30
1. covelent chemical combination
2.ionic  chemical combination
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