Group 13 period 2
Identify the element .mention the full procedure.

Solution-.
Every group no. defines the no. Of valence electrons in the valence shell and the period number defines the no. Of shell. So, group 13 element has 3 valence electrons and period 2 element has 2 shells in total so, this element is Boron.
 
Another example with full procedure,  lets have example of Sodium,
Its configuration is 2,8,1 so, it belngs to first period as it has 1 valence electron and 3rd period due to having 3 shells.