An element has electronic configuration 1s2,  2s2,  2p6,3s2,3p3. Predict their period, group and block

By observing principal quantum number (n), Orbital (s, p, d, f) and equating no. of e−s we are able to find the period, block and group of element in periodic table.From the configuration ,  n=3 that represents 3rd orbit                                        no.of valency electrons =5  that   represents 15th group.