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Required answers :-
Q. 1. What is valency of iron in Fe2S3?
=> 3 is the valency of iron in Fe2S3.
Q. 2. The positively charged ions are called : ?
=> cations are the positively charged ions.
Q. 3. The element copper has a variable valency, these valencies are : ?
=> The element Copper has a variable valency, these valencies are: +2 and +3.
Q. 4. If the atomic number of Phosphorus is 15, the electronic configuration of phosphorus is : ?
=> If an atomic number of phosphorus is 15 then give electronic configuration of p^-3.
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