the diameters of four different types of atoms are given below. Atom A: 6.35x10^-7 mm; Atom B 1.80x10^-6 mm; Atom C: 2.00x10^-7 mm; Atom D: 2.50x10^-8 mm. What is the order of these atoms from largest to smallest?

Atom B: 1.80x10^-6 mm; Atom A: 6.35x10^-7 mm; Atom C: 2.00x10^-7 mm; Atom D: 2.50x10^-8 mm.