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Assertion : The 19^(th) electron in pota...

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

A

Assertion and reason both are correct statements and reason is correct explanation for assertion.

B

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C

Assertion is correct statement but reason is wrong statement.

D

Assertion is wrong statement but reason is correct statement.

Text Solution

Verified by Experts

The correct Answer is:
A
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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.

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.

The enrgy level fo 4s-orbital is less than 3d- orbital because :

4s orbitals has less energy than 3d orbital

In multi-electron atom 4s-orbital is lower in energy than

After filling the 4d-orbitals, an electron will enter in:

Statement 1. In potassium atom, 19th electron enters 4s orbital and not 3d orbital. Statement 2. Orbital energies are compared by (n+l) rule.

Assertion (A) : When the transition element ionises, the 4s -orbital electrons are removed before the 3d -orbital electrons. Reason (R ) : The energy of 3d -orbital electrons is lower than that of 4s -orbital electrons.