Which atom is least likely to form an ion? which atom is least likely to form an ion? carbon, c aluminum, al bromine, br phosphorus, p?

The relative ionization energies of the following atoms are from least to most, aluminum 5,9915 eV, phosphorus 10,4867 e V, carbon 11,2603 eV and bromine 11,8318 eV so the least likely element to form ions is the aluminum atom.