Question

explain the following The atomic radii of Cl, I and Br are 99, 133 and 114 pm, respectively.​

Answer 1

Explanation:

• The elements Cl, Br and I are the halogens and placed in the 17th group in the periodic table.
• As we go down in the group atomic size increases due to an increase in the atomic number.
• And hence effective nuclear charge decreases due to this the valence electrons are held less tightly because they experience less attractive forces from the nucleus.
• Which results in an increase in the atomic radius.
• Hence Cl has less atomic radius than Br and I.
• Order is Cl < Br < I