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Q. Find the formula of halide of a metal whose successive ionization enthalpies are $x, 2 x, 5 x, 100\, x\, kJ \,mol ^{-1}$ respectively

Classification of Elements and Periodicity in Properties

Solution:

There is large difference between $3\text{rd} $ and $4\text{th}$ I.E.
$\therefore +3$ oxidation state will be more stable and the formula of halide is $MX _{3}$.