The elements in a period have the same number of valence shells. But how does potassium and gallium have the same number of valence shells. pls explain

Dear student,

The valence shell is the last shell in which the valence electrons are present. This means the last electrons which are present are in the valence shell only.


Electronic configuration of potassium is = 1s22s22p63s23p64s1
In the above electronic configuration, we can see that the last electron present in the 4th shell.

Electronic configuration of Gallium is = [Ar] 3d104s24p1
In the above electronic configuration, here also the last electron present in the 4th shell. So, the valence shell in a period is the same but subshells are different.

Regards




 

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