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Electrons in an atom are arranged in shells. The maximum number of electrons in the n-th shell is
A2 n
Bn + 2
C2 n^2
Dn / 2
Answer & Solution
Correct answer: C. 2 n^2
1. The chapter gives the 2n^2 rule for shell capacity.
2. n = 1 holds 2, n = 2 holds 8, n = 3 holds 18 electrons.
3. These match the formula 2 n^2.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on electron arrangement_
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