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2016-01-19T00:14:53+05:30

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In an atom the number of electronegative and electropositive ions would be same, i.e. it is electrically neutral. Eg: in CaO, Ca contains +2 and O contains -2. So, charges are produced in pairs.
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2016-01-21T15:01:09+05:30
Because there is always transfer of electrons.
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