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The enrgy level fo 4s-orbital is less th...

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

A

4s-orbital is more near to nucleus than 3d-orbital

B

4s-orbital penetrates more into the nucleus than 3d-orbital

C

4s-orbital can have only two elecrrons whereas 3d can have 10 electrons

D

4s-orbital is spherical and 3d-orbital is doulbe dumb-bell

Text Solution

Verified by Experts

The correct Answer is:
B
4s-prnotal have three small peaks closer to nucleus in addition to 4th higher peak and thus penerates more in nucleus .
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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.

  • The energy of sigma2s -orbital is greater than sigma^("*")1s orbital because

    A
    `sigma2s` orbital is bigger than als orbitat
    B
    `sigma2s` orbital is a bonding orbital whereas, `sigma^("*")1s` is an antibonding orbital
    C
    `sigma2s` orbital has a greater value of n than `sigma^("*")1s` orbital
    D
    none of the above.

  • 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

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    While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?

    While filling up of the electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why ?

    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.

    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.

    Statement I: The 3p orbitals are higher in energy as compared to 3s orbital. Statement II: (n + I) for 3p orbitals is lower than that of 3d orbitals.

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