Group VI-B and Group VII-A: Halogens

Chromium

Essential trace element

• Glucose tolerance factor --> BEQ

Molybdenum

Essential trace element

• Co-factor enzyme

Molybdenum Oxide - MoO3

Use:

• MOL-IRON (Molybdenum oxide + Ferrous

sulfate

Uranium

First radioactive element discovered by Henri

Becquerel.

• It is used in the manufacture of atomic bombs

Flourine

Most electronegative element

• Super halogen (Linus Pauling)

Chlorine

aka: Dephlogisticated Muriatic Acid

• Chloros: Greenish Yellow Gas

• Chloride: Most abundant extracellular anion

• Use as water disinfectant

• Chlorides are precipitated with silver nitrate

Bromine

Greek meaning: Stench

• Dark reddish-brown fuming liquid with

suffocating odor

• Quickly attacks the skin to cause burn that is slow to heal. (Ammonia water prevents action).

Use:

• Sedative

• Depressant

Poisoning :

• Bromism

Bromine compound

Bromine 10th N solution

• aka: Koppeschaar’s solution

Use:

• Assay of phenols and related compounds

Iodine

Greek meaning: Violet colored

• Most metallic halogen

• Oldest germicide still used today

Iodine

Deficiency:

• Goiter

Toxicity:

• Iodism

Antidote: Corn starch. Sodium thiosulfate

Phenolic Iodine Solution

Aka: bolton’s solution

Anto bacterial and irritant

Strong iodine solution

aka: Lugol’s solution

• 5% Iodine with KI in water

Astatine

Only metallic and synthetic halogen resembling iodine.

• Only radioactive halogen

• Half-life (8.1 hours) -rarest element