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How to find the group number of an element?

Can you please explain it with many examples?

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by shifan

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Can you please explain it with many examples?

by shifan

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if u have atomic no then u can find the group no. by its electron configration

ex. Cl= atomic no is 17

electronic configuration is 2, 8, 7

find that the no of valence electrons of element here is so

but 2nd and 3rd period have 8 element in it in and it have 1 , 2 13 to 18 groups in it so for cl is the we get 7 in the 3 rd period so arrange the 7 in 1-2,13 to 18 group no. so it take 17 group no.

for period = period is the number of shell the element is having so here chlorine has 3 shells (K-2, L-8, and M-7).

and therefore period is 3