The correct increasing order of first ionisation energy is-Na lt- K lt- Al lt- Mg-K lt- Na lt- Mg lt- Al-K lt- Na lt- Al lt- Mg-K lt- Mg lt- Al lt- Na-

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The correct i...

Question

The correct increasing order of first ionisation energy is:

Na < K < Al < Mg

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K < Na < Al < Mg

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K < Na < Mg < Al

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K < Mg < Al < Na.

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Solution

The correct option is B
K < Na < Al < Mg

Ionisation energy decreases down the group, but increases from left to right in a period. So, K < Na < Al < Mg is the correct order of ionization energy.

Potassium is present in the fourth period. Sodium, aluminium and magnesium are present in the third period.

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The first ionistation enthalpies of Na, Mg, Al, and Si are in the order
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