Barium is smaller than Cesium
Caesium atom has a larger atomic radius.
Element M can be a choice of 4 elements, Beryllium, Magnesium, Calcium, or Strontium. The element must have an oxidation of +2, which means group 2 elements. The atomic radius of a barium atom is 222pm. Radium has a larger atomic radius that Barium, so that is eliminated, and Barium is the same as Barium so that is also eliminated.
Radium has a much larger atomic radius than beryllium.
One factor is that barium is a much larger atom and ion than magnesium. So the bond between barium and the hydroxide anion is much weaker, making it easier for the two ions to be pulled apart in water solution.
MgSO4
a general answer is that if it is a cation the ion is smaller than the atom due to loosing one or more electrons which would decrease the size of the radius anions are larger because they are gaining more electrons and electron electron repulsion is greater which spreads the anion apart
Caesium atom has a larger atomic radius.
Barium (137.327) is larger than aluminum (24.305)
Element M can be a choice of 4 elements, Beryllium, Magnesium, Calcium, or Strontium. The element must have an oxidation of +2, which means group 2 elements. The atomic radius of a barium atom is 222pm. Radium has a larger atomic radius that Barium, so that is eliminated, and Barium is the same as Barium so that is also eliminated.
The electronegativity of barium is less than that of strontium.
Barium has a radius (not raduis) which is almost twice as large as that of silicon.
The radius (not raduis) of a barium atom is nearly double that of silicon.
Cation is always smaller than corresponding neutral atom.
100 microfarad
Caesium (260 pm) has a larger covalent atomic radius than beryllium (105 pm).
Barium.
Radium has a much larger atomic radius than beryllium.