Respuesta :
Answer: Option (A) is the correct answer.
Explanation:
It is known that atomic size of atoms decreases on moving from left to right in a period of the periodic table. Whereas atomic size increases on moving from top to bottom in a group.
Lithium and cesium are both alkali metals. On the other hand, both neon and radon are noble gases.
Both cesium and radon belongs to sixth period. Cesium being at the extreme left side is larger in size than radon which is at the extreme right side of periodic table. Therefore, atomic radius of cesium will be larger than atomic radius of radon.
Whereas both lithium and neon belongs to second period. Lithium being at the top left side of periodic table has larger atomic radius than neon which is at the top right side.
Thus, we can conclude that out of the given options cesium has the largest atomic radius.
