Which elements have the most similar properties? A. K and Mg
B. O and N
C. Ne and Ar
D. Na and Nb

K and Mg

Explanation: This is because: Discussion of calcium is often paired with magnesium, and for good reason. As neighbors on the periodic table, they have similar chemical properties and behave similarly in several chemical reactions. They share some regulatory mechanisms and act in many of the same physiologic arenas.

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