An ion may be monatomic or polyatomic.
A household air ionisers give air molecules a negative charge
so that, floating around a room, they attach themselves to positively charged particles
of dust or air-borne bacteria so that they are more readily removed from circulation.
An ion may be monatomic or polyatomic. A household air ionisers give air molecules a negative charge so that, floating around a room, they attach themselves to positively charged particles of dust or air-borne bacteria so that they are more readily removed from circulation.
See also in The book of science:
Readings on wikipedia: