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Valence Bond Theory

IN WHAT WAYS ...

Question

IN WHAT WAYS SPATIAL DISTRIBUTION OF ORBITALS IN 1s AND 2s DIFFER

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Solution

Dear student!
The spatial distribution of each s- orbital is same but they differ only due to the presence of nodes and in 1s- orbital there is zero no. of nodes while in 2s-orbitals there is one node.

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Q. Assertion :The radial probability distribution curves of 1s, 2p, 3d - orbitals are identical in shape. Reason: The number of nodal planes present in these orbitals are different.

x -

axis as the internuclear axis, the overlap of which of the following orbitals will not form a sigma bond and why?

1 s

2 s

1 s

2 p_{x}

2 p_{y}

2 p_{y}

1 s

2 s

Q. The relative energies of molecular orbitals are found to be in increasing order as follows-

σ (1 s) < σ^{*} (1 s) < σ (2 s) < σ^{*} (2 s) < [π (2 p_{y}) π (2 p_{z})] < σ (2 p_{x}) < [π^{*} (2 p_{y}) π^{*} (2 p_{z})] < σ^{*} (2 p_{x})

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. How many orbitals are having higher energy compared to

σ_{2 S}

L i_{2}

molecule from the molecular orbitals given below.

σ^{*} 1 s, σ^{*} 2 s, σ 1 s, π 2 p_{y}, π^{*} 2 p_{x}, π^{*} 2 p_{z}, π 2 p_{z}

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