Assertion - Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells- Reason- A shell can have maximum 2n-2 electrons-Assertion is correct but the reason is incorrectAssertion is incorrect but the reason is correctBoth assertion and reason are correct but reason is not the correct explanation for the assertionBoth assertion and reason are correct and the reason is the correct explanation for the assertion

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Maximum Electrons

Assertion : T...

Question

Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum ${2n}^{2}$ electrons.

Assertion is correct but the reason is incorrect

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Assertion is incorrect but the reason is correct

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Both assertion and reason are correct but reason is not the correct explanation for the assertion

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Both assertion and reason are correct and the reason is the correct explanation for the assertion

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Solution

The correct option is D Both assertion and reason are correct and the reason is the correct explanation for the assertion
A shell can have maximum ${2n}^{2}$ electrons.
Here, K-shell is the 1 $^{st}$ shell and L-shell is the 2 $^{nd}$ shell.
That is; For K-shell, $n = 1$ , $2$ x $1^{2} = 2$
And for L-shell, $n = 2$ , $2$ x $2^{2} = 8$
K-shell and L-shell can have maximum 2 and 8 electrons respectively.
Helium atom has 2 electrons and both these electrons are placed in the K-shell.
Lithium atom has 3 electrons; 2 in K-shell and 1 in L-shell.
Thus, the reason is the correct explanation for the assertion.

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Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells. Reason: A shell can have maximum 2n2 electrons.

Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum ${2n}^{2}$ electrons.