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The maximum electrons in a shell is given by which formula?
A2n squared
B3n squared
C4n squared
D5n squared
Answer & Solution
Correct answer: A. 2n squared
1. Here n is the orbit or energy level number.
2. The K shell therefore holds two.
3. The formula is 2n squared.
_Source: NCERT Class 9 Science, Ch 4 'Structure of the Atom'_
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