What does “Ionization energy” actually mean in Periodic Table & Periodicity, and why does it matter for JEE?
the energy to remove the outermost electron; it rises across a period and falls down a group.
In simple words: the energy to remove the outermost electron; it rises across a period and falls down a group. Getting Ionization energy clear matters because JEE questions on Periodic Table & Periodicity usually test this idea directly, not just a formula you memorised.
Key point
Ionization energy
Common mistake
ignoring small dips (e.g. B<Be, O<N) caused by sub-shell stability.
Memory tip
removing an electron is hardest from small, tightly-held atoms.
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