Arrange sodium chlorine phosphorus decreasing of the atom size
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Explanation: Atomic size decrease across a Period (from left to right) BUT INCREASE DOWN A GROUP. You have 3 alkaline earth metals: 3rd period magnesium; 5th period strontium; and 6th period barium. Clearly magnesium is the SMALLEST metal, and barium is the LARGEST.
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Atomic size decrease across a Period (from left to right) BUT INCREASE DOWN A GROUP. ·
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