Rubidium has an atomic radius of 248 picometers.
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Rb (rubidium) is the largest element among K (potassium), Rb (rubidium), Na (sodium), and Li (lithium). This is because as you move down a group in the periodic table, the atomic size increases due to the addition of more electron shells.
Correct. Silicon (Si) has a larger atomic radius than carbon (C) because as you move down a group on the periodic table, atomic radius tends to increase due to the addition of more electron shells.
Cesium will have a larger atomic radius than magnesium. This is because atomic radius tends to increase down a group in the periodic table, and cesium is located below magnesium in the periodic table.
Helium has the smallest atomic radius out of hydrogen, sodium, and lithium. This is because helium has a full electron shell, leading to a smaller effective nuclear charge that pulls the electrons closer to the nucleus, resulting in a smaller atomic radius.
Bromine has the largest atomic radius among fluorine, chlorine, and bromine. Atomic radius increases down a group on the periodic table, so bromine, located at the bottom, has the largest atomic radius of the three elements.