The correct order of first ionization potential is: (a) F>He>Mg>N>O (b) He>F>N>O>Mg (c) He>O>F>N

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The correct order of first ionization potential is: (a)...

The correct order of first ionization potential is: (a) $\mathrm{F}>\mathrm{He}>\mathrm{Mg}>\mathrm{N}>\mathrm{O}$ (b) $\mathrm{He}>\mathrm{F}>\mathrm{N}>\mathrm{O}>\mathrm{Mg}$ (c) $\mathrm{He}>\mathrm{O}>\mathrm{F}>\mathrm{N}>\mathrm{Mg}$ (d) $\mathrm{N}>\mathrm{F}>\mathrm{He}>\mathrm{O}>\mathrm{Mg}$

The correct order of first ionization potential is:
(a) $\mathrm{F}>\mathrm{He}>\mathrm{Mg}>\mathrm{N}>\mathrm{O}$
(b) $\mathrm{He}>\mathrm{F}>\mathrm{N}>\mathrm{O}>\mathrm{Mg}$
(c) $\mathrm{He}>\mathrm{O}>\mathrm{F}>\mathrm{N}>\mathrm{Mg}$
(d) $\mathrm{N}>\mathrm{F}>\mathrm{He}>\mathrm{O}>\mathrm{Mg}$

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Key Concepts

First Ionization Energy

First ionization energy is the minimum energy required to remove the most loosely held electron from an isolated, neutral gaseous atom. It is a fundamental property that reflects the strength with which an atom holds onto its electrons, and thus it is indicative of an element's reactivity.

Periodic Trends

Across a period in the periodic table, first ionization energy generally increases due to the increasing effective nuclear charge that holds electrons more tightly. Conversely, down a group, ionization energy decreases as the outer electrons are farther from the nucleus and more shielded by inner electrons, making them easier to remove.

Subshell Stability

The stability of electron configurations, particularly half-filled and fully-filled subshells, can lead to anomalies in the expected periodic trends. Atoms with half-filled subshells, for example, may exhibit higher ionization energies than expected because these configurations contribute additional stability.

Electron-Electron Repulsion Effects

Electron-electron repulsion within atomic orbitals can affect the first ionization energy. In cases where electrons are paired in an orbital, increased repulsion can lower the ionization energy relative to an atom with a half-filled orbital, where repulsion is minimized due to more even electron distribution.

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