an atom in an excited state has an electron configuration of 2-7-2. What would be the electron configuration of this atom if it returned to the ground state?

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule