1. Tardigrade
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  3. Chemistry
  4. Assertion: The outer electronic configurations of Cr and Cu are 3d5 4s1 and 3d10 4s1 respectively. Reason: Electrons are filled in orbitals in order of their increasing energies given by (n + l) rule.

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Q. Assertion: The outer electronic configurations of $Cr$ and $Cu$ are $3d^{5} 4s^{1}$ and $3d^{10} 4s^{1}$ respectively.
Reason : Electrons are filled in orbitals in order of their increasing energies given by $(n + l)$ rule.

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Solution:

Correct answer is (b) If both assertion and reason are true but reason is not the correct explanation of assertion.