Calcium ion has the two outside electrons removed; therefore, it should be smaller than the atom.
Aluminum ion has a +3 charge on it while Mg ion has just +2; therefore, the protons in the nucleus of Al exert a greater pull on its electrons than Mg and the Al ion should be smaller.
Which one in this pair has the larger radius? Explain
a. Calcium atom or calcium ion
b. Aluminum ion or Magnesium ion
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