Question

Write the trends in the atomic radii of elements in a group.

Answer 1

The arrangement of elements in horizontal rows of the modern periodic table is called a period.

The atomic radii is the distance of the electron in the outermost shell from the nucleus. The atomic radii is equal to half of the distance between the nuclei of two adjacent atoms in a metallic crystal.

As the atomic number of the element in a group increases, the number of energy shells of electrons also increases. Because of the increase in the number of shells, the atomic radii of the atom also increases in a group.

Therefore, the atomic radii of elements in a group increases.