Is “Ion” a Scrabble word?
Yes
ION
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Ion
/ˈaɪɒn/
noun
1.An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.