What is the complete ground state electron configuration for the selenium atom?

Se
1s² 2s²2p⁶ 3s²3p⁶ 4s²3d¹⁰3p⁴

You can do it just follow the periodic table 
1)groups 1 and 2 give s-electrons , and number of the level equals number of the period
2)groups from 13 to 18 give p-electrons,  and number of the level equals number of the period
3) groups from 3 to 12 give d-electrons and level one less than number of the period