The correct order of second ionization potential of carbon,...

The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is:
(a) $O>N>F>C$
(b) $O>F>N>C$
(c) $\mathrm{F}>\mathrm{O}>\mathrm{N}>\mathrm{C}$
(d) $\mathrm{C}>\mathrm{N}>\mathrm{O}>\mathrm{F}$

Key Concepts

Ionization Energy

Ionization energy is the energy required to remove an electron from an atom or ion. It is a fundamental concept in physical chemistry and atomic physics, describing how strongly an electron is held by an atom or ion. This energy increases as the effective nuclear charge experienced by an electron increases or as electrons are removed from lower energy levels in subsequent ionizations.

Successive Ionization Energies

Successive ionization energies refer to the progressively higher energies required to remove additional electrons from an atom or ion after the first electron has been removed. The second ionization energy is typically higher than the first, as the resulting ion has a higher effective nuclear charge on its remaining electrons. This concept is essential in understanding the variation in ionization potentials among elements.

Effective Nuclear Charge

Effective nuclear charge is the net positive charge experienced by an electron in an atom, accounting for both the total nuclear charge and the shielding effect of inner electrons. It is pivotal in determining ionization energies because electrons that experience a higher effective nuclear charge are more strongly bound to the nucleus, thereby increasing the ionization energy required to remove them.

Electron Configuration

Electron configuration describes the distribution of electrons in an atom or ion’s orbitals. It provides insight into the stability and energy levels of the electrons. Variations in electron configurations, such as half-filled or fully filled subshells, can lead to exceptions in periodic trends of ionization energies, making it a key concept in predicting and explaining successive ionization energy values.

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