4. A researcher listed the first five ionization energies for a silicon atom in order from first to
fifth. Which of the following lists corresponds to the ionization energies for silicon?
A) 780 kJ, 13,675 kJ, 14,110 kJ, 15,650 kJ, 16, 100 kJ
B) 780 kJ, 1575 kJ, 14,110 kJ, 15,650 kJ, 16,100 kJ
C) 780 kJ, 1575 kJ, 3,220 kJ, 15,650 kJ, 16,100 kJ
D) 780 kJ, 1575 kJ, 3,220 kJ 4,350 kJ, 16, 100 kJ
E) 780 kJ, 1,575 kJ, 3,220 kJ, 4,350 kJ, 5,340 kJ

Ionization energy is the energy required to remove electrons from an atom. The number of ionization energies theoretically possible in an atom depends on the number of electrons in the atom.

However, the energy required to remove electrons from a shell in an atom increases progressively.

The second ionization energy is higher than the first ionization energy. The third ionization energy is higher than the second ionization energy and so on.

A final word, the ionization energies for electrons on the valence shell are closer to each other. However, if we go beyond the first shell into the inner shells, there is a sudden tremendous increase in ionization energy.

This jump occurs because more energy is required to remove inner electrons than is required to remove valence electrons.

We see this in silicon, the fourth ionization energy is 4,350 kJ while the fifth ionization energy of silicon is 16, 100 kJ for the reason explained above.

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