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The d-And-f-Block Elements

Short Answer Type

1. Silver atom has a completely filled d orbitals (4d¹⁰) in its ground state. How can you say that it is a transition element?

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2. In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?

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3. The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

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How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

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5. Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

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Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

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7. Calculate the 'spin only' magnetic moment of M²⁺_(aq) ion (Z = 27).

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8. Explain why Cu⁺ ion is not stable in aqueous solutions?

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9. Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

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10. On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

On the basis of incompletely filled 3d orbitals in case of scandium atom is its ground state (3d¹), it is regarded as a transition element. On the other hand, zinc atom has completely filled dorbitals (3d¹⁰) in its ground state as well as in its oxidised state, hence it is not regarded as a transition elements.

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