CHEM

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Consider the relation shown for the radius of the species indicated. Which choice presents a valid comparison?

a) Na > Na+

b) Ca^+2 > Ca+

c) Cl > Cl-

d) S- > S^2-

I think that the answer is "a"...but not 100% certain.
pls help.

  • CHEM -

    a is correct.

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