Question

Give the formulae of the compounds formed from the following sets of elements:

Answer 1

Answer:

where are the elements?

Answer 2

We can derive or find out the formula of any compounds if we know the valency of the atoms that are present in the compound.

For example :

Formula of Sodium Chloride is - NaCl

Reason : Na has 1 as valency and similary Cl also has valency 1. So while doing criss cross both of the valencies gets interchanged and thus the formula becomes NaCl.