Hydrogen forms metallic (interstitial) hydrides with the d and f transition elements. Which of the following statements is correct?
A) These substances have distinct stoichiometric formulas like ionic hydrides.
B) Hydrogen forms bonds with the metals by donating its electron to the valence band of the metal.
C) Hydrogen molecules and atoms occupy holes within the crystal structure of the metal.
D) These substances are poor catalysts.
E) These hydrides are stabilized by hydrogen bonding forces.

Question

Quizplus · Accepted Answer

Hydrogen molecules and atoms occupy holes within the crystal structure of the metal. This is known as interstitial hydrides. These substances do not have distinct stoichiometric formulas like ionic hydrides, as hydrogen is not present in a specific ratio to the metal atoms. Also, hydrogen does not donate its electron to the valence band of the metal, as this would result in an ionic bond, not a metallic bond. These substances can act as catalysts, contrary to option D. Finally, hydrogen bonding forces are not involved in the stabilization of these hydrides.

Hydrogen Forms Metallic (Interstitial) Hydrides with the D and F