done by :ali.nabil and muhiddine tarek
What is hydrogen?
Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic mass of 1.00794, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol 1 H), has a single proton and a single electron and zero neutrons
the discovery of hydrogen
where can hydrogen be found
Hydrogen is found in large amounts in giant gas planets and stars, it plays a key role in powering stars through fusion reactions.
Hydrogen is one of two important elements found in water (H2O). Each molecule of water is made up of two hydrogen atoms bonded to one oxygen atom
Physical description of Hydrogen
It is a colorless, tasteless and odorless gas.
It is the lightest gas.
It is insoluble in water.
It is highly inflammable and burns with blue flame forming water.
boiling temperature of hydrogen is -252oC.
Bond energy of H-H is 431 Kj/mole.
Electro negativity of hydrogen is 2.1.
Ionization potential of hydrogen gas is 13.54 electron volt.
melting point of hydrogen is 259C.
state of Hydrogen is gas
density of hydrogen is 0.08988 g/L (at 0 °C, 101.325 kPa)
Uses of hydrogen
It is used for the manufacturing of fertilizers.
It is used in the preparation of vegetable ghee.
It is used as rocket fuel.
It is used in the preparation of ammonia (NH3) and methanol (CH3OH).
It is used in the preparation of oxy-hydrogen flame which is used in welding due to production of high temperature.
It is used in filling weather balloons.
It is used to prepare tungsten filament.
It is used to prepare low temperature in liquid state.