It is determined that an unknown element is lustrous, a good conductor, and its atoms have 3 valence
electrons and 1 more energy level than an atom of
Potassium (K). Which element is it?

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.