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Write your question here (Keep it simple and clear to get the best answer)an element has stomic number 12.to which period and group of the periodic table

it will belong


When we do electronic configuration of that element having atomic number 12, it will be 2, 8, 2.
First 2 electron fills in the first shell, then 8 electron will occupy in second shell and finally, left 2 electron will go in third shell.As the last electron goes to third shell, so the element is in 3rd period.
Here, outer most electron is 2 , so it is also called valence electron, so the element is in 2nd group.
Hence the position will be, 3rd period, 2nd group ( element is Mg)
Hope now you understand the actual concept of finding the position.
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