Answers

2016-03-24T09:39:53+05:30
The valency of an electron is nothing but the number of electrons gained or lost during an chemical reaction.
if the number of electrons is more than 4 than we have to caluculate by his way: -(8-number of valence electron)
then if the valency is 4 or less than 4 then the valency is same as the valence electrons
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but u have not mention it
i think he mos spelled it
u have to mention ki compound has no valency
ok baba i wrote my thing
ok
2016-03-24T09:52:06+05:30
 compound has no valency BUT it is the element that has valency 
when we write any any element with its valency then it is called ion.
e.g. Na, K, has ----- one valency we write Na+1 & K+1 
Ca, Ba. Mg have ---- two valency each Ca+2 , Ba+2 ,,Mg+2 
Al,has ---- three valencies----------- Al+3 
these when come in contact with nonmetals accepts one,or two, or three electrons 
to form a compound e.g. Na Cl , K Br .so Cl & Br also have one valency each 
now when there is more than one elements in a species then the charge on 
them is called valency e.g. CO3-2 . SO4-2 have two valency each 
NOW I THINK YOUR QUESTION IS THAT HOW TO FIND THE CHARGE 
ON THESE IONS [ CATION & ANIONS ] 

e g. NH4 now it has +1 charge as-------------- 
NH3 + H+ ---------------> NH4+1 

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