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Electron Gain Enthalpy

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Write observed electronic configuration of elements from first transition series having half filled d-orbitals.

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Solution

Electronic configuration of elements from first transition series having half filled d-orbitals
(1) Chromium (Cr) - $[A r] 4 s^{1} 3 d^{5}$
(2) Manganese (Mn) - $[A r] 4 s^{2} 3 d^{5}$
out of these two chromium shows deflection form its expected $[A r] 4 s^{2} 3 d^{4}$ to attain half filled d orbitals i.e.,to attain stability.

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Q. Statement 1: An element that has an electron configuration of

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}

is a transition element.
Statement 2: The transition elements from scandium to zinc are filling the

3 d

Which of the following transition elements will have a half-filled d-orbital?

Q. Statement 1: The ground state electron configuration orbitals of elemental

C u

[A r] 4 s^{1} 3 d^{10}

Statements 2: Completely filled and half-filled

d -

orbitals bestow special electronic stabilization.

Q. I: An element that has the electron configuration

{1 s}^{2} {2 s}^{2} {2 p}^{6} {3 s}^{2} {3 p}^{6} {3 d}^{3} {4 s}^{2}

is a transition element.
II: In atoms of transition elements, the 1s, 2s, 2p, 3s and 3p orbitals are completely filled in the ground state.

Q. Out of first

100

elements no.of elements having electrons in

3 d

orbital (in their complete electronic configuration) are:-

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