Q. 4 E3.8( 25 Votes )
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Answer :
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.
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