element x has successive ionization energies of 738 kj/mol, 1451 kj/mol, and 7733 kj/mol. element z has successive ionization energies of 1000 kj/mol, 2252 kj/mol, and 3357 kj/mol. what are the possible identities of x and z? element x has successive ionization energies of 738 kj/mol, 1451 kj/mol, and 7733 kj/mol. element z has successive ionization energies of 1000 kj/mol, 2252 kj/mol, and 3357 kj/mol. what are the possible identities of x and z? x could be p, since the third ionization energy is so large. z could be na, since its ionization energies keep going up in regular intervals. x could be mg, since its third ionization energy is so large. z could be s, since its ionization energies are large and keep going up in regular intervals. x could be na, since the second and third ionization energies are so much larger than the first one. z could be a noble gas, since its ionization energies are large and keep going up in regular intervals. x could be fe, since its third ionization energy is so large. z could be h since its ionization energies keep going up in regular intervals.