Which of the following atoms has the highest first ionization energy?

  • A
    $K$
  • B
    $Sc$
  • C
    $Rb$
  • D
    $Na$

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In which of the following arrangements is the order not correct according to the property indicated against it?

As one moves along a given row in the periodic table,ionization energy

The successive ionisation energy values for an element $X$ are given below. Element $X$ belongs to which group?
$1^{st} \text{ IE} = 410 \ kJ \ mol^{-1}$
$2^{nd} \text{ IE} = 820 \ kJ \ mol^{-1}$
$3^{rd} \text{ IE} = 1100 \ kJ \ mol^{-1}$
$4^{th} \text{ IE} = 1500 \ kJ \ mol^{-1}$
$5^{th} \text{ IE} = 3200 \ kJ \ mol^{-1}$

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