To list the atoms in order of decreasing atomic radii, we need to compare the atomic radii of each element. Atomic radii generally increase as we move down a group in the periodic table and decrease as we move across a period from left to right.
Let's compare the given atoms:
- 50Sn (Tin): Tin is located in period 5, group 14 of the periodic table.
- 37Rb (Rubidium): Rubidium is located in period 5, group 1 of the periodic table.
- 53I (Iodine): Iodine is located in period 5, group 17 of the periodic table.
- 55Cs (Cesium): Cesium is located in period 6, group 1 of the periodic table.
Based on the general trend, the atomic radii would decrease as we move from Sn to Cs. However, there is an exception when comparing elements within the same group. In this case, Cs would have a larger atomic radius than Sn because Cs is in a higher period.
So, the order of decreasing atomic radii from largest to smallest would be: 55Cs > 50Sn > 53I > 37Rb