Imagine element number 15 had never been discovered. what characteristics would it have based on its location on the periodic table

It would be a solid polyatomic non-metal that has 15 electrons, 16 neutrons, and 15 protons and its atomic mass would be 30.974. It would have 3 energy levels with 2 electrons at the first energy level, 8 at the second, and 5 at the third.

Do u have the n? or maybe the m?