An element that has the valence electron configuration 3s23p3 belongs to which period and group

Since the valence shell is n = 3 it is in Period 3. Since there are 4 valence electrons (2 in 3s and 2 in 3p) it is in Group 4A (14).

For 4s2 4p1, the valence shell in n = 4 so this is in Period 4 and there are 3 valence electrons putting it in group 3A (13)

This video uses the periodic table to give you a really helpful visual understanding of how orbital notation works. I hope this helps. :)