The Haviest Elements

             *The Haviest Elements:-

1. OSMIUM-  It is the heaviest element of all (22.61g/cub cm). It was discovered by the British chemist Smithson tannant in 1803. He names it after the Greek word for smell because it smell bad. Osmium is very hard , and is used to  make hard- wearing points such as the nibs of fountain pens.
2. Platinum- Platinum was  used before anyone realized that it was an element. It weighs almost as much as osmium(21.45g/cub cm) and is used to make jewellery that s even more expansive than gold. It is also used in catalytic converters in cars to reduce the pollution from exhaust gases.
3. Plutonium- It was discovered  in 1941and is a heavy and highly radioactive metal. It is used as a nuclear fuel and in nuclear weapons.
4. Gold- It is the best know of all heavy metals(19.299g/cub cm).It is used to make jewellary and coins etc.

         *Elements in sea water :-

                Mg/L
1. Oxygen - 857,000
2. Hydrogen - 107,800
3. Chlorine - 19,870
4. Sodium - 11,0050
5. Magnesium - 1,326
     
  *Highest melting point:-
1. Carbon - 3,527 C
2. Tungsten - 3,433 C
3. Rhenium - 3,186 C
4. Osmium - 3,033 C
5. Tantalum - 3,017 C