Question

In the modern periodic table, what trend is observed in the atomic radius in a group and why is it so?

Answer 1

• In a group (vertical column) of the modern periodic table, the atomic size rises as we move down the group.
• Reason:
  • The outermost electrons are farther from the nucleus because the following components has an additional electron shell.
  • The shielding effect of inner electrons reduces the drag on outer electrons, increasing the atom's size even with an increase in nuclear charge.