Which of the following transitions involves the maximum amount of energy?

  • A
    $M_{(g)}^{-} \longrightarrow M_{(g)}$
  • B
    $M_{(g)} \longrightarrow M_{(g)}^{+}$
  • C
    $M_{(g)}^{+} \longrightarrow M_{(g)}^{2+}$
  • D
    $M_{(g)}^{2+} \longrightarrow M_{(g)}^{3+}$

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Which of the following electronic configurations represents the element with the lowest ionization energy?

The first four ionisation energy values of an element are $191$,$578$,$872$ and $5962 \ kcal$. The number of valence electrons in the element is :-

For one of the elements,various successive ionization enthalpies (in $kJ \cdot mol^{-1}$) are given below:
$I.E.$ $1^{st}$ $2^{nd}$ $3^{rd}$ $4^{th}$ $5^{th}$
Value $577.5$ $1810$ $2750$ $11580$ $14820$

The element is:

What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down a group?

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The first ionization enthalpy of $Na$,$Mg$ and $Si$,respectively,are: $496, 737$ and $786 \ kJ \ mol^{-1}$. The first ionization enthalpy $(kJ \ mol^{-1})$ of $Al$ is

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