Question

rank the following in order of smallest atomic radius to largest 1. b 2. y 3. cs 4. ga

Explanation:

Atomic radius increases down a group and decreases across a period. B (Boron) is in period 2. Ga (Gallium) is in period 4. Y (Yttrium) is in period 5. Cs (Cesium) is in period 6. As we move down the periods, the number of electron shells increases, leading to a larger atomic radius.

Answer:

B < Ga < Y < Cs