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ChemistryChemistry
4 January, 12:47

Which of the following correctly compares the radii of Na and Na+?

A. Na has a smaller radius than Na + because Na has expanded its electron cloud.

B. Na has a larger radius than Na + because Na has lost its outermost energy shell.

C. Na has a smaller radius than Na + because Na + has expanded its electron cloud.

D. Na has a larger radius than Na + because Na + has lost its outermost energy shell.

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Answers (1)
  1. 4 January, 14:55
    0
    The statement that correctly compares the radii of Na and Na + is

    Na has a larger radius than Na + because Na + has lost its outermost energy shell (answer D)

    Explanation

    sodium (Na) is in atomic number 11 and hence has 1s2 2s2 2p6 3s1 or [Ne] 3s1 electron configuration.

    Sodium metal (Na) loses 1 electron in the outermost shell to form Na + with 1s2 2s2 2p6 electron configuration.

    Therefore Na has larger atomic radius than Na + because Na + is formed when 1 electron is lost by Na atom.

    In addition the nuclear charge of Na + is greater than that of Na. This make the valence electron of Na + to attracted closer to the nucleus which make the atomic radius of Na + to be smaller than that of Na.
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Home » Chemistry » Which of the following correctly compares the radii of Na and Na+? A. Na has a smaller radius than Na + because Na has expanded its electron cloud. B. Na has a larger radius than Na + because Na has lost its outermost energy shell. C.
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