What is a dehydrate in chemistry?

Which statements describe polyatomic ions? check all that apply. polyatomic ions have many charges. polyatomic ions have one overall charge. polyatomic ions repel other ions to form ionic bonds. polyatomic ions attract other ions to form ionic bonds. polyatomic ions are made up of only one type of atom. polyatomic ions are made up of two or more types of atoms.

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

I’m an electrically neutral atomic any element, there are equal numbers of