1. Hydrogen is the lightest element known since it has an atomic mass of 1.0079
2. Hydrogen resembles Group 1 elements because it has electronic configuration( 1s 1) similar to alkali metals and can loose one electron to form unipositive ions
3. Hydrogen also resembles elements of group 17( Halogens) because hydrogen just like halogens needs just one electron to acquire the configuration of the nearest noble gas i. e. Helium
4. Hydrogen has three isotopes- Protium, deuterium and tritium
Isotopes No. of No. of No. of Mass protons( p) neutrons( n) electrons( e) number
( M)
Protium( 1H)
Deuterium( 1 H or D)
Tritium 1 H or D
1 0 1 1
1 1 1 2
1 2 1 3
5. In elemental form Hydrogen exists as a diatomic molecule H2 and is called dihydrogen
6. Water gas is name given to the mixture of carbon monoxide and hydrogen. Water gas is also called synthesis gas or syngas
7. The production of dihydrogen can be increased by reacting carbon monoxide of syngas mixtures with steam in the presence of iron chromate as catalyst. This reaction is called as water gas shift reaction
8. The process of producing ' syngas ' from coal is called ' coal gasification '
C( s) + H2O
1270 K
2( g)