How to identify groups and periods of elements

1.	How to identify groups and periods of elements
Answer» Adding 10 is for the p block elements the number of valence electrons is more than 2 add 10 so that you get the correct group number, Bt it is not applicable for all elements of block p nd d Number of shells will give you the period and the number of valence electrons will give you the group Have uh*? Have I ever heard about afbau rule ? I am a student and for identifying groups and periods you have to observe periodic table carefully No...sir I mean to say if we want to find group Nd period of Na or Fe .... Then how will we find that Groups are vertical while periods are horizontal

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