# atomic number 17
## Noun (N)
### Sense: a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)
- ก๊าซคลอรีน
- คลอรีน
- เลขอะตอม 17