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2015-08-12T20:55:22+05:30

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With the help of atomic number we will find the electronic configuration then with the help of electronic configuration we will be ale to know the number of electron in last shell by which we can make out the valency of the electron.
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according to the order
like in K shell
we put 2 electrons
then in L we put 8
then in M we put 18
2015-08-12T20:58:00+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
It is very easy and simple
1st point no of electrons in the last shell should be  8
use the formula 2n*n where n is the number of shells k,l,m etc
this formula is used to find the no of electrons that can be accommodated in a shell
for example if atomic number of an element is 34

now for first shell=2*1*1=2
for 2nd shell2*2*2=8
for third shell2*3*3=18
now by adding  them we get 26 and 
34-26=6
and we know that 8 electrons should be there in the lass shell 6-8=-2
hence valency is -2
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y r u telling him of 11th
and its subsell
*subshell
is anyone there to answer me!!!!!????????????
we can simply say that electronic configuration is the arranging of electrons in orbitals orbitals are said as 1,2,3,4,................... ork ,l m,n etc