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First Ionization Energy Trend (First IE increases across a period, decreases down a group (general trend))

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First IE increases across a period, decreases down a group (general trend)

What each symbol means

SymbolWhat it stands for
I_1First ionization energy — energy to remove outermost electron from gaseous atom

When to use this

Gaseous atoms, ground state. Exceptions: e.g. B < Be (2p easier than 2s), O < N (half-filled 2p³ stability). Questions often test these kinks.