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What is hydrogen?
Why is hydrogen?
In History
In Chemistry The
Atom
Atomic weight
Isolution
Uses
Uses in IC Engines Fuel
cells
The Perodic
Table Of The Elememts |
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What is hydrogen?
Why is hydrogen?
In History
In Chemistry The
Atom
Atomic weight
Isolution
Uses
Uses in IC Engines Fuel
cells
The Perodic
Table Of The Elememts |
Hydrogen in
chemistry
English name
: Hydrogenfgggggggggggggggggggggggggfgggggggfgggggg
French: Hydrogenefgbbbbbbbbbbbb
German: Wasserstoff
Italian:
Idrogenobbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Spanish: Hidrogenbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Group number: 1bbbbbbbbbbbbbbbbbb
CAS
Registry number: 1333-74-0bbbbbbbbbbbbbbbbbbbbbbbbbbbb
Symbol : Hbbbbbbbbbbbb
Atomic no. : 1bbbbbbb
Relative
atomic mass : 1.0bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Weight : 1.00794(7) bbbbbbbbbbbbbbbbbb
Colourless ,no taste and smell bbbbbb
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In the periodic table of the elements, hydrogen is the firsts element .Its
symbol is H , atomic no. is 1 and the weight is 1.00794(7) . Chemical
property is highly flammable , most reactive ,
also explosive and it can form compounds with other substances
directly . Hydrogen is colourless , no taste and
smell molecule gas . Hydrogen is very different to liquefy (boiling
point is -252.87*C and critical temperature is -239.9*C) and its freezing
point is -259.14*C.
On the earth , hydrogen of the mass no. is 1 , there is about 99.98% . There is a very small number of the mass no. is 2 , there is about 0.015% ,and the name is Liquid H2 . And the mass no. is 3 , about 10-16% ,the name is Tritium (3H) .
Hydrogen is the lightest element and is by far the most abundant element
in the universe, making up about about 90% of the universe by weight .
Hydrogen as water (H2O) is absolutely essential to life and is present
in all organic compounds.Hydrogen gas was used in lighter-than-air balloons
for transport but is far too dangerous because of the fire risk (Hindenburg).
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