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Electron Gain Enthalpy

The I.E1, and...

Question

The $I . E_{1},$ and the $I . E_{2}$ in $k J m o l^{- 1}$ of a few elements disignated by $P, Q, R, S$ are shown below:
$\begin{matrix} Atom & I . E_{1} & I . E_{2} P & 2372 & 5251 Q & 520 & 7300 R & 900 & 1760 S & 1680 & 3380 \end{matrix}$
Which of the element is likely to be reactive metal?

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Solution

Lesser the Ionisation energy, lesser energy will requires to remove an electron from the metal, more will be the reactivity of the metal. Since $Q$ is having the least $I . E .$ among others, $Q$ will likely to be most reactive.

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{A X}_{2}

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