Why is it that the radius of a Ca atom is 0.197 nm and Ca (2+) ion is 0.099 nm ?

account for this difference

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  • 1 decade ago
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    Because the two electrons lost to form the Ca(2+) ion are in a higher energy level with a larger radius than the rest of the electrons. When the 2 ions are lost, the remaining electrons are all in the lower energy shells with the smaller radius.

  • 1 decade ago

    The outer electrons in the valence shell are stripped off to make the Ca2+. Those extra electrons in their outer orbits account for the greater effective radius. (Note: Protons stay the same...they have to for it to be Ca.)

  • 1 decade ago

    two reasons:

    1) Ca2+ does not have the two outermost electrons which means automatically the radius is smaller

    2) in Ca2+ as the electrons are lesser the attracting force experienced by the remaining electrons in relatively more and hence there is some shrinkage

  • 1 decade ago

    because the Ca (2+) has two more protons then it does electrons. This causes the electrons to move closer in to the stronger positive force.

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  • 1 decade ago

    The less electrons in the ion, the less space is taken up by electrons

  • 1 decade ago

    there is no electrons in 4s so its smaller

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