All given elements belong to second period of periodic table. And we know that going from left to right along the period the number of shells (Principle Quantum Number) remains constant and the number of protons (atomic number) increases, due to this increase in nuclear charge the valence electrons are more attracted towards the nucleus resulting in decreasing the atomic radii, Hence, the atomic radii from larger to smaller radii are as ,
Li Be B C N Ne
Largest --------------------------------> Smallest
