Question

what is lanthanoid contraction? expain the cause and it sequences on electronegativity and basicity of oxides and hydroxides​

Answer 1

Answer:

Explanation:

• 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).

• The Lanthanide Contraction is caused by a poor shielding effect of the 4f electrons. Gd because as atomic number increases, the atomic radius decreases. Yb because it has a larger atomic number