Which among the following is the largest element?

Question

KollegeApply · Accepted Answer

K Explanation: Atomic size generally increases down a group (as more electron shells are added) and decreases across a period from left to right (as the effective nuclear charge increases, pulling electrons closer). • Na and Mg belong to Period 3, while K and Ca belong to Period 4. Therefore, K and Ca are larger than Na and Mg. • Within Period 4, Potassium (K) is to the left of Calcium (Ca), meaning it has a lower effective nuclear charge and a larger atomic radius.

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