Halogens

IODINE (I-53)- vapor irritates eyes and respiratory system- highly toxic- used to make thyroxine

ASTATINE (At-85)- radioactive- one of the rarest natural occuring elements

Group 177 Valence ElectronsNonmetalsChemically Active

HALOGENS

"to produce sea salt"

BROMINE (Br-35)- vaporizes easily- vapor irritates eyes and throat-highly corrosive

FLUORINE (F-9)- one of the most dangerous elements known- attacks skin and throat- reacts explosively with water

CHLORINE (Cl-17)- toxic, can be fatal- attacks the respiratory tract, causing coughing, congestion, and flu-like symptoms