* Ammonia (NH₃): This is a neutral molecule. It has one nitrogen atom bonded to three hydrogen atoms. It has a lone pair of electrons on the nitrogen, making it a weak base.
* Ammonium Ion (NH₄⁺): This is a positively charged ion. It forms when ammonia gains a proton (H⁺). The nitrogen atom now has four bonds (one to each hydrogen) and a formal positive charge.
Key Differences:
* Charge: Ammonia is neutral, while ammonium is positively charged.
* Structure: Ammonia has three N-H bonds, while ammonium has four N-H bonds.
* Reactivity: Ammonia is a weak base, while ammonium is a weak acid.
Why there's no "ammonium radical":
Radicals are species with unpaired electrons, making them highly reactive. The ammonium ion has all its electrons paired, so it cannot be a radical.
Let me know if you have any more questions about ammonia, ammonium, or other chemical concepts.
