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

  • A
    $1s^1$
  • B
    $1s^2, 2s^2, 2p^6$
  • C
    $1s^2, 2s^2, 2p^2$
  • D
    $1s^2, 2s^2, 2p^6, 3s^1$

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The ionization energy will be higher when the electron is removed from

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If first ionization enthalpies of element $X$ and $Y$ are $419 \ kJ \ mol^{-1}$ and $590 \ kJ \ mol^{-1}$,respectively and second ionization enthalpies of $X$ and $Y$ are $3069 \ kJ \ mol^{-1}$ and $1145 \ kJ \ mol^{-1}$,respectively. Then the correct statement is :-

Which of the following species has the highest ionisation potential?

Given below are two statements. One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: The first ionization enthalpy for oxygen is lower than that of nitrogen.
Reason $R$: The four electrons in $2p$ orbitals of oxygen experience more electron-electron repulsion.
In the light of the above statements,choose the correct answer from the options given below.

Which of the following has the highest first ionisation energy?

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