Yes, BROMINES is a Scrabble word!

Letter values in Scrabble US: B 3, R 1, O 1, M 3, I 1, N 1, E 1, S 1.

Is it a valid word?

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

a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water

Also: atomic number 35.

Not playable in Scrabble US: BR.