2. Which of the following correctly lists the five atoms in order of increasing size (smallest to largest)? *
OA) Br< Pb < At < Cs < Fr
OB) Br < Cs < At < Pb < Fr
OC) Br < Cs < Pb < At < Fr
OD) Br < At < Pb < Cs E) Br < Pb < Cs < At < Fr