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STATEMENT-1 : The 19^(th) electron in po...

STATEMENT-1 `:` The `19^(th)` electron in potassium atom enters into 4s-orbital than in 3d-orbital.
and
STATEMENT-2 `:` `(n+1l)` rule is followed for determining the orbital of lowest energy state.

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Assertion : The 19th electron in potassium atom enters 4s-orbital and not 3d orbital. Reason : The energies of the orbitals can be compared with the help of (n+l) rules.

4s orbitals has less energy than 3d orbital

4s orbitals has less energy than 3d orbital

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