What is 80% as a ratio

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

Afamily is one another name for a group on the table of elements.