A Greek philosopher named Democritus of Abdera coined the word atom in about 420 B.C.
Ionized atom Excited atom
The term atom comes from ancient Greek meaning indivisible.
An atom smasher is an informal term for a particle accelerator.
When an atom has an electric charge it is called an ion.
isotope
radioisotope
"nucleus"
An atomus is an obsolete term for an atom.
"nucleus"
unstable, radioactive
The term which means the amount that a given atom (or radical) attracts electrons is electronegativity.
The term atom is greek, and a literal translation is un-cut.