Yes, FLUORINES is a Scrabble word!

Letter values in Scrabble US: F 4, L 1, U 1, O 1, R 1, I 1, N 1, E 1, S 1.

Is it a valid word?

FLUORINES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite

Also: f, atomic number 9.