Question

What is lanthanide contraction and what are its consequences?

Answer 1

due to poor shielding effect of 4 of electrons effective nuclear charge increases and radius decreases from lanthanum lutetium.Ionic radius decreases in regular pattern but atomic radii follow is regular pattern because configuration is irregular .the gradual and study decrease in radii across the period is known as contraction .

due to Lanthanide contraction the basic character of oxide and Hydroxide decreases