atomic number 17

Noun atomic number 17 has 1 sense

• atomic number 17(n = noun.substance) chlorine, cl - 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);
is a kind of chemical element, element, gas, halogen
has particulars: radiochlorine