Pick out the incorrect statement for transition metalsA. they have low – InterviewSolution

InterviewSolution

1.	Pick out the incorrect statement for transition metalsA. they have low melting and boiling points (or low enthalpies of atomization)B. 5d-elements have higher energies than 3d or 4d-elementsC. Zr and Hf have almost identical atomic and ionic radiiD. thtey form interstitial compounds.
Answer» Correct Answer - A a) Transition metals have high enthalpies of atmization, because they form strong metallic bonds, due to participation of `(n-1)` d-electrons along with ns-electrons in metallic bonding. b) This is due to the greater reffective nuclear charge acting on outer valence electrons, because of weak shielding of nucleus by 4f-electrons. c) The normal size in increase from Zr to Hf is almost exactly balanced by lanthanide contraction. d) Because small size, atom of H, He, C, N occupy the vacant spaces in the crystal lattice of transition metal.

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