Which of the following elements has the highest ionisation energy?

  • A
    $He$
  • B
    $C$
  • C
    $N$
  • D
    $H$

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The electronic configuration of an element with the largest difference between the $1^{st}$ and $2^{nd}$ ionisation energies is

The first $I.E.$ of $Na, Mg, Al$ and $Si$ are in the order:

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Which of the following species has the highest ionisation potential?

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