Elements a,b,c and d have the following electronic configurations:
`a:1s^(2),2s^(2),2p^(6)`
`b:1s^(2),2s^(2),2p^(6),3s^(2),3p^(1)`
`c:1s^(2),2s^(2),2p^(6),3s^(2),3p^(6)`
`d:1s^(2),2s^(2),2s^(1)`
Which elements among these will belong to the same group of periodic table.

Explanation

`{:(,,"Element"),((a)1s^(2)","2s^(2)","2p^(6)(z=10),,-"Ne"),((b)1s^(2)","2s^(2)","2p^(6)","3s^(2)","3p^(1)(z=18),,-Al),((c)1s^(2)","2s^(2)","2p^(6)","3s^(2)","3p^(1)(z=18),,-Ar),((d)1s^(2)","2s^(2)","2p^(1)(z=5),,-B):}`
In the above elements ,Ne and Ar belong to same group (Noble gases `18^(m)` group)
A1 and B belong to the same group `(13^(th)` group)