Question

How does the electronic configuration of an Atom related to its position in the modern periodic table. give example
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Answer 1

the valence electron indicates the group no.
whereas the no. of shell indicates the period no.
ex-Na
valence electron-1
so group 1
and no.of shells-3
so period 3
it's as simple as that..
hope you understand

Answer 2

the number of periods determine the number of shells
the group number defines the number electrons in the outermost shell.
eg:element belonging to 2nd group and 3rd period?
ans: element is in 3rd period
therefore number of shells=3

that is=2,8,?

to find the number of electrons in the outer most shell.just check the froup number.
group no=2
there fore  electronic configuaration=2,8,2

so if get a electronic configuration just check the
no:of shells=period
no;of electron in outer most shell=the group number