mayankdevnani
  • mayankdevnani
How to find the valency of an element?? Also give me some examples...
Chemistry
katieb
  • katieb
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nubeer
  • nubeer
valancey is something or the spots left to be filled by electrons in a the last shell
nubeer
  • nubeer
if you have some question already u can tell that way would be easier to tell ..
mayankdevnani
  • mayankdevnani
no, i have not any particular question just give some examples.

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mayankdevnani
  • mayankdevnani
mayankdevnani
  • mayankdevnani
ok. nubeer what is the valency of mg
anonymous
  • anonymous
1) Find out the electronic configuration. That is the number of electrons for that ion. Electronic config. for Mg is 2,8,2. 2) Now see how many electrons you get in the last orbit. 3) That number become your valency. Mg is +2. If the last is more than four then it means it is the negative ion and hence check how many electrons are needed to stabilize that ion. For eg. Chlorine is 2,8,7. Therefore to complete the octet, it needs 1 electron and hence valency of chlorine is -1. You need to see weather the number of electrons in last orbit is more than, less than or equal to 4. If more than it is a negative ion and its valency can be -1,-2,-3. If less than 4 than valency can be +1,+2,+3. And if equal to 4 than it is a metalloid which acts as a metal as well as a non-metal. Eg.--- silicon. Valency of Na is +1 coz its electronic config. is 2,8,1. And now you find out for V as a practice. Valency is the combining capacity of an element and valence electrons are the number of electrons in the last orbit which are lost, gained or shared during the course of a reaction.
mayankdevnani
  • mayankdevnani
just copy and paste @Areesha.1D
mayankdevnani
  • mayankdevnani
anonymous
  • anonymous
@mayankdevnani yeah, i brought you information you needed, yet were incapable of finding yourself.
nubeer
  • nubeer
lol what she is said is right.. ok few things you should know is The valency of an element is the measure of electrons it needs or needs to loose to obtain a stable structure.. what is stable structure.. stable structure is when any atom have 8 electrons in the last shell.
nubeer
  • nubeer
so if we take Mg.. it has configuration 2,8,2 means it has 2 electrons in the outer most shell.. whether Mg can loose 2 electrons or gain 6 more.. it's easy to loos 2 rather then gaining 6 electrons so Mg preferes to loose.. so when Mg loose it will get a charge of+2 on it.
nubeer
  • nubeer
group 1 to 3 looses electrons these groups also called metals.. and the non-metals looses electrons.
mayankdevnani
  • mayankdevnani
ok..so what is the valency of cl
nubeer
  • nubeer
Cl.. 2,8,7.. tell me what u think its easy for him to loose or gain to achieve it's outer shell to be filled by 8 electrons.?
anonymous
  • anonymous
@nubeer let him figure it out.
mayankdevnani
  • mayankdevnani
looseing right!!
nubeer
  • nubeer
yes @Areesha.1D i have told him all the details won't tell answer will just walk him through..
nubeer
  • nubeer
hmmm nooo.. do u think he will just break 7 parts of it structure and not just having 1 more electron.. llook u have to think loosing and gaining is same it's not about tough.. think which is easier way to have 8 electrons in outer shell.. whther he can just gain 1 and have 8 or loose 7 electrons.
anonymous
  • anonymous
@nubeer exactly! have fun llol
nubeer
  • nubeer
:P
mayankdevnani
  • mayankdevnani
hmmm, he can just gain 1 and have 8 .right
nubeer
  • nubeer
yes.. so its easy and when any atom gain an electron it get's a positive charge.. so what charge you think Cl will get?
mayankdevnani
  • mayankdevnani
i don't know!!! plz tell me and give me another example and i can do this..k
nubeer
  • nubeer
look when electron is loose positive charge appears and when gains a negative charge appears.. so Cl gain 1 electron so it will get -1 charge.. u can take any if by any chance hypothetcially Cl gains 4 electron then it gets -4 charge and if it loose 7 electron so will get +7 charge.. get it? do for Al.
mayankdevnani
  • mayankdevnani
so finally what is the valency of cl
mayankdevnani
  • mayankdevnani
mayankdevnani
  • mayankdevnani
nubeer
  • nubeer
i think i mentioned the valency in the last post.. did you read it? it has just gain 1
anonymous
  • anonymous
omg -_- @mayankdevnani put a BIT of effort in, look how well @nubeer explained !!!
mayankdevnani
  • mayankdevnani
kkk...my chance to find the valency of al..plz wait
mayankdevnani
  • mayankdevnani
al its electronic confugiration is |dw:1354100607658:dw|
nubeer
  • nubeer
yes.
nubeer
  • nubeer
have to make 8 in last shell.. so right now 3 in last shell so easy to loose or gain?
mayankdevnani
  • mayankdevnani
gain
nubeer
  • nubeer
hmm how much have to gain to get 8? it would have to take 5 more .. so no.. its better to loose look group 1-3 will loose electrons.. and group 5-8 gains electrons.. made more easy for u.
nubeer
  • nubeer
now look in which group Al is in the periodic table.
mayankdevnani
  • mayankdevnani
13
nubeer
  • nubeer
13? or 3?
mayankdevnani
  • mayankdevnani
13 is atomic number
anonymous
  • anonymous
Oh lord
mayankdevnani
  • mayankdevnani
nubeer
  • nubeer
nooo not atomic number.. do you know about groups in a periodic table and sorry.. my internet is a liittle slow.
mayankdevnani
  • mayankdevnani
mention not
nubeer
  • nubeer
so what about group numbers do you know of them?
mayankdevnani
  • mayankdevnani
so its valency is 3
nubeer
  • nubeer
hmm well yes.
mayankdevnani
  • mayankdevnani
but howz that...it loose its electrons
nubeer
  • nubeer
yes how many it loose? 3 .. and when any atome looses it gets a positive charge..
nubeer
  • nubeer
http://www.chem4kids.com/files/elem_pertable.html this is something about groups if you don't know.
mayankdevnani
  • mayankdevnani
oh i see
mayankdevnani
  • mayankdevnani
now its my chance give me some example
nubeer
  • nubeer
ok try Ba, Ca, Na , K, Cr, B, N, Br.. try any u want.
mayankdevnani
  • mayankdevnani
first Ca
mayankdevnani
  • mayankdevnani
electronic confugiration-|dw:1354101724985:dw| so it looses electrons and have a positive charge of 2+ right!!
nubeer
  • nubeer
yes right..
mayankdevnani
  • mayankdevnani
thnx....
mayankdevnani
  • mayankdevnani
last its silicon
mayankdevnani
  • mayankdevnani
electronic configuration-|dw:1354101886249:dw| so it looses electrons and have a positive charge of 4+ right!!!
nubeer
  • nubeer
yes..
mayankdevnani
  • mayankdevnani
thnx...
mayankdevnani
  • mayankdevnani
i understand very nicely.. thnx @nubeer and @Areesha.1D
mayankdevnani
  • mayankdevnani
and also give me medal for my hard work
nubeer
  • nubeer
i am glad.. you are welcome ..
anonymous
  • anonymous
lol thank the Dear Lord above XD congratulations!

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