| 释义 |
atomic number 17
基本英英
英Noun: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 saltas in sea water
Noun:
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 |