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Hydrogen forms metallic (interstitial) hydrides with the  d and  f transition elements. Which of the following statements is correct?

▸ These substances have distinct stoichiometric formulas like ionic hydrides.

▸ Hydrogen forms bonds with the metals by donating its electron to the valence band of the metal.

▸ Hydrogen molecules and atoms occupy holes within the crystal structure of the metal.

▸

These substances are poor catalysts.

▸ These hydrides are stabilized by hydrogen bonding forces.

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