proton number

13 LETTERS · STARTS WITH P

proton number is a valid 13-letter word worth 18 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3R1O1T1O1N1N1U1M3B3E1R1
3 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 3 + 3 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does proton number mean?

1