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Assertion : The 19th electron in potassi...

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.

A

if both assertion and reason are correct and reason is correct explanation for assertion .

B

If both assertion and reason are correct but reason in not correct explanation for assertion.

C

If assertion is correct but reason is incorrect.

D

If both assertion and reason are incorrect.

Text Solution

Verified by Experts

The correct Answer is:
A
Reason is the correct explanation for assertion.
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" Energy of the n^(th) orbit "-

4s orbitals has less energy than 3d orbital

Knowledge Check

  • Assertion : The 19^(th) electron in potassium atom enters into 4s orbital and not the 3d - orbital. Reason : (n+1) rule followed for determining the orbital of the lowest energy state.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Assertion. The 19th electron in potassium atom enters into 4 s-orbital and not the 3 d-orbital Reason. (n +l) rule is followed for determining the orbital of the lowest energy state.

    A
    If both assertion and reason are true, and reason is the true explanation of the arrertion
    B
    If both assertion and reason are true, but reason is not the true explanation of the assertional
    C
    If assertion is true, but reason is false
    D
    If both assertion and reason are false

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

    A
    Statement-1 is true , Statement-2 is also true.
    Statement-2 is the correct explanation of Statement-1
    B
    Statement-1 is true , Statement-2 is also true.
    Statement-2 is not correct explanation of Statement-1
    C
    Statement -1 is true, Statement-2 is false.
    D
    Statement-1 is false, Statement-2 is true.

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    In each of the following questions a Statement of Assertion (A ) is given followed by a corresponding statement of Reason (R ) Just below it . Of the statement mark the correct answer as Assertion . When the atoms of first transition series ionize the 4s- orbital electrons are ionized before the 3d- orbital electrons . Reason . The energy of 3d- orbital electron is lower than that of 4s-orbital electronic .

    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 : For the outermost electron in Na atom, the orbital angular momentum is zero. Reason : For 3s electron , l = 0 and orbital angular momentum is zero.

    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.

    Energy of electron in a orbit of H -atom is

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