Tl belong to the group number
13
12
14
15
As we learnt
P Block elements -
P block elements comprise those belonging to group 13 to 18 and together with the S block elements are called the main group elements.Outer most configuration varies from ns2 np1 to ns2np6 in each period.
-
The group 13 elements are B, Al, Ga, In and Tl.
Therefore, Option(2) is correct