the maximum number of electrons that can be present in the n shell is equal to (a) n2 (b) (2n2) (c) 2n2 (d) (2n 1)2
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Explanation:
Assertion
The maximum number of electrons in the shell with principle quantum number n is equal to 2n
2
.
Reason
Two electrons can have the same value of theree quantum numbers n, l and m, but must have the opposite spin quantum number.
Answer
In n
th
shell, the total number of orbitals are n
2
where each orbital can occupy a maximum of two electrons with opposite spin quantum number as +1/2 and -1/2. Rest of the three quantum numbers in a given orbital will be same.
Thus it will follow Pauli's exclusion principle.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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