Name the elements represented by the following symbols :
Au, Pb, Sn, Hg.
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The elements represented by the following symbols are:
Au → Gold
Pb → Lead
Sn → Tin
Hg → Mercury
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Why is the symbol S for sulphur, but Na for sodium and Si for silicon ?
Write the full form of IUPAC.
If the symbol for Cobalt, Co, were written as CO, what would be wrong with it ?
Explain the terms 'valency' and 'variable valency'.