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Question
Which among the following is the largest element?
Options
Na
Mg
K
Ca
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Solution
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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