Which one of the following elements has the highest ionisation energy?

  • A
    $[Ne] \, 3s^2 \, 3p^1$
  • B
    $[Ne] \, 3s^2 \, 3p^2$
  • C
    $[Ne] \, 3s^2 \, 3p^3$
  • D
    $[Ar] \, 3d^{10} \, 4s^2 \, 4p^2$

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The order of first ionization potentials of elements $Li, Be, B, Na$ is:

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The first ionization enthalpies of $Li$,$Be$,and $C$ are $520$,$899$,and $1086 \ kJ \ mol^{-1}$ respectively. Which of the values $800$ or $900 \ kJ \ mol^{-1}$ is more likely for the first ionization enthalpy of $B$? Why?

Which is the correct order of second ionization potential of $C, N, O$ and $F$ in the following?

$A$ neutral atom will have the lowest ionization potential when its electronic configuration is

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