The element which is having the following ionization energies 1012, 1907, 2914, 4964, 6274, and 21267 is phosphorous.
The energy needed to remove one or more electrons from a neutral atom in order to form a positively charged ion is a physical property that is called as the ionization energy. This energy influences the chemical behavior of the atom. By definition, the first ionization energy of an element is generally the energy needed to remove the outermost, or also the highest energy electron from a neutral atom in the gas phase in order to form an ion.
In general, the first ionization energy increases as we go from left to right across the row of the periodic table.
The first ionization energy also decreases as we go down a column of the periodic table.
Similarly the second or third ionization as well takes place in the ion.
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