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Electronic configuration:

⇒ The atomic number of sodium = 11

The electronic configuration of ₁₁Na = 2,8,2

⇒ The atomic number of phosphorus = 15

The electronic configuration of ₁₅P = 2,8,5

⇒ The atomic number of chlorine = 17

The electronic configuration of ₁₇Cl = 2,8,7

⇒ The atomic number of silicon = 14

The electronic configuration of ₁₄Si = 2,8,4

⇒ The atomic number of magnesium = 12

The electronic configuration of ₁₂Mg = 2,8,2

Among the given elements, Na is the element which has largest atoms.

Explanation:

All the given elements have total three shells present in them which means all the elements belong to the same period (period 3).

⇒ The atomic radius decreases as we move from left to right in a period.

⇒ Thus, Na has the largest atomic radius.