Correct

氟

/ fú / 
Strokes

Definition

fluorine (chemistry)

Example

As a Noun

fluorine

1
Fú
氟
quēfázhēng
缺乏症

fluorine deficiency

As a Noun

freon

2
Wúfú
无氟
bīngxiāng
冰箱

freon-free refrigerator