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Dhruba

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Dhruba

Why Do Some Elements Have Variable Valencies?

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09:33 Fri 11th Apr 20144 answers, last by Graham-W 10:25 Sun 11th May 2014
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Dhruba

What's The Diff. Between Atomic Mass And Atomic No.

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16:39 Thu 10th Apr 20146 answers, last by methyl 17:27 Thu 10th Apr 2014

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