Question

Why does elemental hydrogen react with other substances slowly at room temperature?

Answer 1

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hydrogen react with other substances slowly in temperature because the number of shell having outer most electron in hydrogen is L so gap between the nucleus in the atom is very small then so nucleus exert more power to Valence Electrons and not allow to loose it easily but to react with other substances it must looses.

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Answer 2

The elemental hydrogen reacts with “other substances” at slow rate in the “room temperature”. It is because the H-H “bond dissociation enthalpy” is highest for breaking one “single bond” between “two atoms” of any element. When the hydrogen is dissociated at 2000 K, only 0.081% of atom is dissociated whereas to decompose more atom high pressure is needed. Apart from this, the bond enthalpy is also high in hydrogen.