JEE Main Chemistry question

Correct increasing order of first ionisation potential is [BCECE 2003]

(A)Na < Mg > Al < SiCorrect
(B)Na < Mg < Al < Si
(C)Na > Mg > Al > Si
(D)Na < Mg < Al > Si

Answer: (A)

Solution

Ionisation energy generally rises across a period, but Mg's completely filled subshell is extra stable, making its IE higher than Al's (which has a single, easily-removed

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Question ID VK-133162