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Q.

Electronic configuration of sodium, oxygen and magnesium respectively are:


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a

2,7,1: 2,5; 2,7,2

b

2,8,1; 2,6; 2,8,2

c

2,6,1; 2,4; 2,8,2

d

2,7,1; 2,6; 2,8,2 

answer is B.

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Detailed Solution

detailed_solution_thumbnail
Electronic configuration of sodium (Na), oxygen (O) and magnesium (Mg) are 2,8,1; 2,6; 2,8,2 respectively.
The arrangement of electrons in different shells or orbits according to their energy is called electronic configuration.
Sodium having atomic no. = 11; Electronic configuration = 2,8,1
Question ImageAtomic no. of oxygen = 8; Electronic configuration = 2,6
Question ImageAtomic no. of magnesium = 12; Electronic configuration = 2,8,2
Question Image 
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