GROUP VIIA

is the first element in the Halogen group in the periodic
table. Its atomic number is 9 and its atomic weight is 19

Pale Yellow Gas

Most electronegative element
Strongest oxidizing agent, pale yellow gas
Reacts with more non-metals and in a more violent manner than the other halogens.
Will react directly with all non-metals except nitrogen, oxygen and the noble gases.

Natural sources of Fluorine

Fluorine poisoning

the etches or markings on the glass
become permanent after allowing H2SO4 (conc) to stay on
the glass for sometime.

no ppt (difference from Cl¯, Br¯, I¯)

2% in 4 application

8% freshly preparation

Freon, refrigerant, propellant

is a chemical element with the symbol Cl and atomic
number 17. The second-lightest of the halogens, it appears
between fluorine and bromine in the periodic table and
its properties are mostly intermediate between them.

Chlorine is also known as

found in large quantities as sodium chloride in
seawater and in-land deposits.
- It is used as H2O Disinfectant

Greenish yellow gas

Most predominant ANION (responsible for maintenance of osmotic pressure and anion- cation balance)
- Does not readily react to carbon

white ppt of AgCl soluble in NH3 but insoluble
in HNO3.

white ppt of Hg2Cl2

NaOCl

Ca(OCl)2

treatment to achlorhydria
(lacking of HCl)

chlorinated soda lime solution

is a chemical element with the symbol Br and atomic
number 35 and is the third-lightest halogen.

often found with sodium chloride as the sodium,
potassium and magnesium bromide.
- Sedative and antidepressant

yellow ppt of AgBr insoluble in HNO3.

orange to brown layer
due to the liberation of Br2

0.1N Bromine Solution
- Sedative, use in iodometry