Question

Arrange the isotopes of hydrogen in decreasing order of their boiling point and heat of fusion

Answer 1

isotopes. isotopes Forms of elements with the same chemical properties, differing in atomic mass because of differing numbers of neutrons in the nucleus. Thus, hydrogen has three isotopes, of atomic masses 1, 2, and 3, generally written as 1H, 2H (deuterium), and 3H (tritium).

Answer 2

Answer:

decreasing order of boiling point

Tritium > Deuterium> Hydrogen

decreasing order of heat of fusion

Tritium > Deuterium> Hydrogen

Explanation:

Since melting and boiling points increase with increase in mass, the melting and boiling point order is: hydrogen < deuterium < tritium

Since Deuterium contains more mass than Hydrogen,the strength of the inter atomic forces increases,which makes the enthalpy of vapourisation and fusion greater than hydrogen/protium.