Question

Explain occurrence of hydrogen ?​

Answer 1

Answer

⚫The Occurrence of hydrogen

◾Hydrogen is present in the combined state in water to an extent of 11.1% by mass.

◾It is also present in all organic compounds as well as biomolecules.

◾It is also present in all stars because nuclear fusion reactions involved hydrogen isotopes.

◾About 70% of the universe is made up of hydrogen.

◾Hydrogen is also present in Coal, Petroleum , vegetable and animal matter.

◾ It is present in the earth's crust to an extent of 0.9 %.

Answer 2

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• Hydrogen is the lightest element.

• It's atomic number is one.

• It's symbol is H.

• Chemical name - Hydrogen.

• It's Isotopes are - $H_{1}^{1}$ (Protium)

$H_{1}^2}$ (Deuterium)

$H_{1}^{3}$ (Tritium).

• It is the only element that can exist without neutrons.

• It can form both positive and negative ions.

• It is the most abundant chemical substance in universe.

• It can makes more than 90% of the atoms.

• Exist as a gas under normal room temperature. But can exist as liquid under extremely high pressure.

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