Elements

Argon ;----

Most abundant inert gas in the atmosphere.

Ammonia ;----
Gas is produced commercially through Haber process.

Aluminum ;----
Aluminum is the most abundant metal on the Earth's crust. Produced commercially through Hall Herault process.

Cadmium ;----
Causes Itai-Itai disease.

Chlorine ;----
Gas is extracted through Decons process.

Copper ;----
Metal having 2nd highest electrical & thermal conductivity.

Gold ;----
Extracted through cyanide process.

Helium ;----
Lightest noble gas in the Universe.
Helium- found in Sun before finding in Earth. Because it's found in Sun(Helios-Greek), it's termed helium. Joules Jackson & Norman Lockyer (1868) discovered it, while studying Sunlight spectrum. Because it's found in Sun(Helios-Greek), it's termed helium.

Hydrogen(H) ;----
[atomic no.- 1;mass no.- 1]
Most abundant gas in the Universe. Gas is produced commercially through Bosch process.
The most abundant gas in the Universe.

Iridium ;----
Element has the 2nd highest density.

Lead;----
Lead emitted through smoke of automobiles affect Nervous system.

Magnesium ;----
Extracted through Dow process.

Mercury ;----
Causes Minamata disease.

Nitric Acid ;----
Produced commercially through Ostwald process.

Oxygen ;----
Most common element on Earth's crust by mass.

Phosphorus ;----
Phosphorus in Onion cause tears.

Platinum ;----
Called 'little silver'. Polyxene is an ore of Platinum.

Polonium ;----
1st element to have its radioactive properties recognized & investigated.

Potassium ;----
Metal stored in Kerosene.

Sodium ;----
Extracted through Downs process. Most abundant alkali metal.

Strontium ;----

Used in fireworks for red flame.