11 The chlorine is a green gas, that irritates the Respiratory system The chlorine is a green gas, that irritates the Respiratory system. The fatal concentration comes up with 1000 ppm when breathing.CHLORINE = ХЛОР
17 The IARC recognizes cancer as group 1 carcinogens The IARC recognizes cancer as group 1 carcinogens. The PR China has a food standard of 150 ppb for arsenic Compare: The US standard is 10 ppb. Over 137 million people are affected by arsenic poisoning from drinking water.
18 During theQueen Elizabeth erasome women used amixture of vinegar,chalk and arsenic –to whiten their skin
35 Progress in isolating Fluorine was showed by the exceptional dangers of generating fluorine: several 19th century experimenters, the «fluorine martyrs» were killed or badly hurt while working with hydrofluoric acid.In 1970s, concern developed that chlorofluorocarbons were damaging the Ozone layer. By 1996, almost all nations had banned CFCs.FLUORINE = ФТОР