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MCQ
Which of the following is the correct order of atomic sizes in Period 3?
Chemistry
A Na > Mg > Al > Si > P > S > Cl
B Na < Mg < Al < Si < P < S < Cl
C Cl > S > P > Si > Al > Mg > Na
D Na = Mg = Al = Si = P = S = Cl
Explanation

Atomic size decreases across a period from left to right due to increasing effective nuclear charge pulling electrons closer to the nucleus.

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