Explain the following briefly.
a) Inert pair effect
b) Hydration enthalpy
c) Atomisation enthalpy
d) Lanthanide contraction
e) Actinide contraction.
Answers
Answer:
b
Explanation:
hydration enthalpy is the ans
Answer:
The inert-pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals. ... As a result, the inert pair of ns electrons remains more tightly held by the nucleus and hence participates less in bond formation.
Hydration energy (also hydration enthalpy) is the amount of energy released when one mole of ions undergoes hydration.
The enthalpy of atomization (also atomisation in British English) is the enthalpy change that accompanies the total separation of all atoms in a chemical substance (either a chemical element or a chemical compound). This is often represented by the symbol ΔatH or ΔHat.
The lanthanide contraction is the greater-than-expected decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, which results in smaller than otherwise expected ionic radii for the subsequent elements starting with 72, hafnium.
This gradual decrease in the size with an increasing atomic number is called actinide contraction like lanthanide contraction. ... Because of the very poor shielding by 5f electrons, contraction is larger along the period.