Science, asked by pinakimandal53, 1 year ago

As we all know, copper has two valencies, 1 and 2. And we also know that we require two things to write a chemical formula-elements & their valencies. My problem is that if I want to write a chemical formula in which copper is used, then which valency I have to use at right time? Same with Nitrogen. Nitrogen has two valencies, 3 & 5. Which one to use?

Answers

Answered by AnviGottlieb

heya!!

this is a very common problem incurred by almost every chemistry student..

maybe I may help u out?
so basically..
most probably..
the smaller valency is used in most cases..

like There are 2 examples..
CuO
here.. copper has valency two..

and onother one is Cu2O ...
HERE'S VALENCY 1...

so you may use the other elements..
(the other element of the compound)
to determine the valency..

like oxygen in CuO..
has valency 2- ..
so in order to balance it...
we need to have a charge of 2+ on copper..

therefore..
the compound will be Cu2O2
and 2 will be cut..

Apply the same trick with nitrogen too.

and one more tip..

PLEASE LEARN THE WHOLE OF VALENCY AND RADICAL TABLE BY HEART..

IT WILL SURELY HELP YOU OUT..

HOPE THIS HELPS YOU

pinakimandal53: Okay.

pinakimandal53: Can you tell me the ultimate solution to this problem?

AnviGottlieb: i have already told it to you in the Answer

pinakimandal53: I mean that their are some exceptional cases. Mostly, with what type of elements there are exceptional cases? With others, mostly smaller valency is used.

AnviGottlieb: I'll tell you

pinakimandal53: Please tell me.

pinakimandal53: When will you tell me?

AnviGottlieb: The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.

AnviGottlieb: The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony(Sb), bismuth (Bi), and moscovium

AnviGottlieb: these elements are using smaller valency

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