Question

What is lanthenoide conpraction. Give reason
लेन्थेनाइड़ संकुचन क्या है। कारण दीजिये।​

Answer 1

Lanthanoid contraction, also called lanthanide contraction, in chemistry, the steady decrease in the size of the atoms and ions of the rare earth elements with increasing atomic number from lanthanum (atomic number 57) through lutetium (atomic number 71).

Answer 2

Explanation:

Lanthanide contraction is the gradual decrease in the atomic and ionic size of lanthanoids with an increase in atomic number. Causes of lanthanide contraction: With an increase in the atomic number, the positive charge on nucleus increases by one unit and one more electron enters same 4f