Caesium atom has a larger atomic radius.
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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.
Cesium has a larger first ionization energy compared to potassium. This is because cesium is located further down the periodic table in the alkali metal group, meaning it has a larger atomic radius and a lower effective nuclear charge, both of which make it easier to remove an electron from potassium than from cesium.
Barium is smaller than caesium. Different elements have different atomic radii, with caesium having a larger atomic radius compared to barium.
Sulfur has a larger atomic radius than magnesium. This is because as you move down a group in the periodic table, atomic radius increases due to the addition of more electron shells. Magnesium is higher up in the periodic table than sulfur, so it has a smaller atomic radius.
Cesium has a larger atomic radius than rubidium. This is because as you move down a group in the periodic table, the atomic radius generally increases due to the addition of more energy levels and electrons.
Element M is likely calcium. It is more reactive than magnesium and has a smaller radius than barium, making it a good fit for the given properties. Calcium forms a compound MCl2 when reacting with chlorine.