Each entry lists five things:

• Structure — the defining atoms and bonds, written in condensed form.
• Hybridization — the orbital hybridization of the key atom(s) in the group.
• Geometry — the approximate bond angle and shape around that atom.
• Polarity — whether the group is polar or nonpolar, and why.
• Typical reactivity — the kind of chemistry the group tends to undergo, in one or two sentences.

These five properties are the ones used repeatedly throughout the handbook to predict how an unfamiliar molecule will behave.

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