Hydrogen does not possess the metallic character under normal conditions because
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a
it has very low ionisation enthalpy
b
it has very low electron gain enthalpy
c
it has very high electron gain enthalpy
d
it has very high ionisation enthalpy
answer is D.
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Detailed Solution
Hydrogen has three isotopes 1. Protium H 11 2. Deuterium H 12 3. Tritium H 13Protium is the most common isotope of hydrogen with an abundance of 99.98%