What is the neutral atom that has its first two energy levels filled, has 7 electrons in its third energy level, and has no other electrons

Which statement justifies that phosphine (ph3) is a polar molecule?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

What are the chemical names of these compounds? ke: mg3n2: reset next