Which should be larger, the potassium atom, K, or the potassium ion, K??
A. The potassium atom and the potassium ion are exactly the same size and only differ in charge.
B. The potassium ion, K?, is larger since it has an extra electron which increases its size.
C. The potassium atom, K, with an additional shell of electrons is larger.
D. The potassium ion, K?, is larger since charging an atom always makes it larger.
Answer: C
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