what is simple definition of electrovalent compound

what is meant by octet and duplet rule?

Define atomic mass unit.

 What are the names for the formulas HClO, HClO_2, HClO_3, HClO₄?

sodium nitrate + sulphuric acid -----> sodium sulphate + nitric acid write formula and then balance it

what is carbon cycle

How ro Balance the Equation : - 

Copper + Nitric Acid -------> Copper Nitrite + Nitric Oxide + Water

chemical formula of nickel bisulphate and Potassium Ferrocyanide

 what are isotopes,isobars and isotones?????

why is the symbol S for sulphur but NA for sodium and SI for silicon?

calculate the no of atoms in 11.5 g of sodium

 what is formula of stannic phosphate?

plzz balance this equation fr me:

AgCl  +  NH₄OH  ---->  Ag(NH₃)₂Cl  +  H₂O

I WANT IT BY 2MORROW EVENING

Why is the electronic configuration of potassium 2,8,8,1 and not 2,8,9, ?

If you say that's bcoz of octet rule then why is the electronic configuration of Chromium 2,8,13,1

why silver exhibits a valency of +1 and +2.