10 points and brainliest!
word bank:
acid, atomic number, base, buffer, chemical bond, chemical reaction, bond, crystalline, ionic bond, matter, neutron, polar molecule, radical, radioactive

a(n) is a group of atoms that behave like they are one ion.

Positively charged ions are called cations, and negatively charged ions are called anions. ... Compounds that do not contain ions, but instead consist of atoms bonded tightly together in molecules (uncharged groups of atoms that behave as a single unit), are called covalent compounds.

A(n) Radical is a group of atoms that behave like they are one ion.

Radical. A radical is a group of two or more atoms that acts like one atom. (element)

sorry if im wrong

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: