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Chemistry

Periodic Table Trends

Quick fact

The element with the highest ionization energy is helium, but if you look at the full trend, francium has the lowest—meaning its outermost electron is practically ready to leave at any moment.

Why this is interesting

You know that sodium reacts explosively with water while neon does nothing at all—but what makes elements so different? The answer lies in a few simple patterns hidden in the periodic table.