16 Questions
What happens to the atomic radii as we move along the 3d series?
Decrease less rapidly
Why do ionization energies increase only slightly along the 3d series?
Increase in shielding effect by 3d electrons
Which configuration do the doubly or more highly charged ions in the d-block have?
No 4s electrons
Why is there a general trend of increasing values of second ionization enthalpy as the effective nuclear charge increases?
One d electron does not shield another electron effectively
The trend of steady increase in second and third ionization enthalpy breaks for the formation of which ions?
Mn2+
Which factor is responsible for the value of ionization enthalpy?
Attraction of electrons towards nucleus, repulsion between electrons, and exchange energy
Why does ionization enthalpy generally increase along a period in the periodic table?
Due to the increase in the effective nuclear charge.
Why are transition elements known for forming colored compounds?
Due to the presence of multiple oxidation states.
Which factor contributes the most to the stability of higher oxidation states in transition metals?
The ability to form multiple bonds.
Why do transition metals have higher melting points compared to main group elements?
Due to the involvement of d electrons in metallic bonding.
Why do lanthanoids generally have higher ionization enthalpies compared to actinoids?
Due to the presence of f electrons in lanthanoids.
Why does copper not replace hydrogen from acids?
Copper has a positive E∘ value, making it more reactive than hydrogen.
Why are the E- values for Mn, Ni, and Zn more negative than expected?
The metals quickly lose electrons and get oxidized.
What is the reason behind the general trend of increasing values of second ionization enthalpy as the effective nuclear charge increases?
The formation of doubly charged ions in the d-block.
How do the properties of Mn2+ and Zn2+ ions relate to their respective E- values?
Mn2+ and Zn2+ have half-filled and fully filled d orbitals respectively.
Why does copper have a positive E∘ value compared to hydrogen?
Copper's d-orbitals are completely filled.
Test your knowledge on the trends in enthalpies of atomisation and variations in atomic and ionic sizes of transition metals. Explore the factors influencing metal-metal bonding in compounds of heavy transition metals.
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