hazardous_halogens

Halogens are a group of non-metals that are found in group 7 of the periodic table www.altcancer.com These non-metals include Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At)!!! They are Toxic!!!!!!!!!!!!!! Do not taste~or smell...

All of these elements have 7 electrons in their valence shell. iodine bromine astatine web1.caryacademy.org [|www.holycross.edu] [|www.lenntech.com]
 * Fluorine -** 9 electrons, arranged in 2,7 - pale yellow gas at room temperature
 * Chlorine -** 17 electrons, arranged as 2,8, 7- green gas at room temperature
 * Bromine -** 35 electrons, arranged in 2, 8, 18, 7 - dark red liquid at room temperature
 * Iodine-** 53 electrons, arranged as 2, 8, 18, 18, 7 - dark crumbly solid
 * Astatine -** 85 electrons, arranged in 2, 8, 18, 32, 18, 7 - black solid
 * Electron arrangement**

chlorine fluorine [|www.webelements.com] [|www.webelements.com] Density increases as moving down the column(Fluorine, Chlorine, Bromine, Iodine, Astatine) Boiling point increases as moving down the column Melting point increases as moving down the column Halogens usually gain one electron to form a singly negatively charged ion. Their reactivity decreases as moving down the column

Uses: Chlorine - Kill bacteria Sterilise water (Swimming pool) Antiseptics Pesticides Dry cleaning Fluorine - toothpaste non-sticking coating of cooking pans Bromine - flame inhibitor chemicals for plastic products Iodine - Used in hospitals: in mild antiseptic solution

Rader's Chem4Kids [|Chem4kids] "Doctor Brown's" Chemistry Clinic [|GCSE Science- Halogens]