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Electronic Configuration for Molecules - (Concept)
Electronic Configuration and Molecular Behaviour
We predict the distribution of electrons in these molecular orbitals by filling the orbitals in the same way that we fill atomic orbitals, by using the Aufbau principle. Lower-energy orbitals fill first, electrons spread out among degenerate orbitals before pairing, and each orbital can hold a maximum of two electrons with opposite spins. Just as we write electron configurations for atoms, we can write the molecular electronic configuration by listing the orbitals with superscripts indicating the number of electrons present. For clarity, we place parentheses around molecular orbitals with the same energy. In this case, each orbital is at a different energy, so parentheses separate each orbital.
For example, the electronic configuration of O2 molecule is given below:
Thus, the electronic configuration of O2 molecule can be written as:
| Exam | Chapter |
| JEE MAIN | Chemical Bonding and Molecular Structure |
During the change of to
, the incoming electron goes to the orbital :
| A. |
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| B. |
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| C. |
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| D. |
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The molecular orbital electronic configuration of O2 is represented as follows:
| A. |
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| B. |
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| C. |
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| D. |
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When $N_2^{+}$ is formed from $N_2$ bond order ________ and when $\mathrm{O}_2^{+}$ is formed from $O_2$
bond order______
| A. |
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| B. |
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| C. |
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| D. |
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According to molecular orbital theory, the species among the following that does not exist is:
| A. |
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| B. |
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| C. |
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| D. |
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Among the following species
the number of species showing diamagnetism is __________.
| A. |
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| B. |
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| C. |
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| D. |
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According to MO theory, number of species/ions from the following having identical bond order is_______.
| A. |
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| B. |
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| C. |
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| D. |
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The total number of electrons in all bonding molecular orbitals of is ........ . (Round off to the nearest integer)
| A. |
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| B. |
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| C. |
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| D. |
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The bond order and magnetic behaviour if ion are, respectively :
| A. |
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| B. |
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| C. |
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| D. |
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According to molecular orbital theory, the number of unpaired electron (s) in is_________.
| A. |
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| B. |
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| C. |
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| D. |
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The spin-only magnetic moment value of species is __________
.
(Nearest integer)
| A. |
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| B. |
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| C. |
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| D. |
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Amongst the following, the number of oxide(s) which are paramagnetic in nature is
| A. |
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| B. |
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| C. |
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| D. |
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Which one of the following constitutes a group of the isoelectronic species?
| A. |
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| B. |
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| C. |
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| D. |
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What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species :
| A. |
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| B. |
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| C. |
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| D. |
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Which molecule/ion out of the following does not contain unpaired electrons?
| A. |
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| B. |
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| D. |
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which of the following option is not related to liner combination of atomic orbital
| A. |
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Which of the following stability order is correct
| A. |
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| B. |
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| C. |
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The correct sequence of energy of N2 MOS
| A. |
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| B. |
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| C. |
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| D. |
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Total number of electron present in $\left(\pi^*\right)$ molecular orbitals of $\mathrm{O}_2, \mathrm{O}_2^{+}$and $\mathrm{O}_2^{-}$is __________
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following has unpaired electron(s) ?
| A. |
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| B. |
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| C. |
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| D. |
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The diamagnetic species among the following is
A) $\mathrm{O}_2{ }^{+}$
B) $\mathrm{O}_2{ }^{-}$
C) $O_2$
D) $\mathrm{O}_2{ }^{2-}$
| A. |
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| B. |
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| C. |
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| D. |
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Which of the following molecule does not contain unpaired electrons?
| A. |
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| D. |
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From elementary molecular orbital theory we can give the electronic configuration of the singly positive nitrogen molecule ion N2+ as:
| A. |
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| B. |
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| C. |
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| D. |
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The electronic configurations of three elements A, B and C are given below.
Answer the questions from 14 to 17 on the basis of these configurations.
$\begin{aligned} & \text { } 1 s^2 2 s^2 2 p^6 \\ & \text { } 1 s^2 2 s^2 2 p^6 3 s^2 3 p^3 \\ & \text { } 1 s^2 2 s^2 2 p^6 3 s^2 3 p^5\end{aligned}$
Stable form of C may be represented by the formula
| A. |
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The number of unpaired d-electrons in $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ is ____________
| A. |
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| B. |
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| C. |
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| D. |
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The number of unpaired electrons in $d^6$, low spin, octahedral complex is:
| A. |
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| B. |
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| D. |
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The distribution of electrons among various molecular orbitals is called the electronic configuration of the molecule.
