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Which one in this pair has the larger radius? Explain
a. Calcium atom or calcium ion
b. Aluminum ion or Magnesium ion

  • Chemistry - ,

    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.

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