Chemical Bonding And Molecular Structure

Question

What do you understand by bond order? How is it related with bond length and bond energy? Explain on the basis of bond order that He₂ molecule does not exist.

Solution

Bond order is equal to one-half of the difference between the number of electrons in the bonding (N_b) and antibonding (N_a) molecular orbitals:

Bond space order space equals space 1 half open square brackets straight N subscript straight b space minus space straight N subscript straight a close square brackets space space space space space space space space space space space

Bond order is inversely proportional to bond length and directly proportional to bond energy.
Bond order of

He subscript 2

molecule

equals space 1 half left square bracket straight N subscript straight b space minus space straight N subscript straight a right square bracket equals space 1 half open square brackets 2 minus 2 close square brackets equals space 0

Thus He₂ consists of no bonds i.e. bond does not exist.

Some More Questions From Chemical Bonding and Molecular Structure Chapter

Write Lewis dot symbols for atoms of the elements Mg, Na, B, O, N, Br.

Draw the Lewis structure for the ionic compound by aluminium and fluorine.

Two elements A and B have the electronic configuration as:
A = 1s²2s²2p⁶3s² and B = 1s²2s²2p⁵Write the empirical formula of the substance containing A and B.

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Chemical Bonding And Molecular Structure

What do you understand by bond order? How is it related with bond length and bond energy? Explain on the basis of bond order that He₂ molecule does not exist.

Some More Questions From Chemical Bonding and Molecular Structure Chapter

Write Lewis dot symbols for atoms of the elements Mg, Na, B, O, N, Br.

Draw the Lewis structure for the ionic compound by aluminium and fluorine.

Two elements A and B have the electronic configuration as:
A = 1s²2s²2p⁶3s² and B = 1s²2s²2p⁵Write the empirical formula of the substance containing A and B.

What type of bonding would you expect between:
(i) a metal and a non-metal
(ii) a non-metal and another non-metal?

Give reasons in one or two sentences for the observation that in their compounds non-metals form anions and not cations.

Out of Na and K, which will form a more stable ionic bond?

Which will have a greater lattice enthalpy: NaCl or MgO?

Is a covalent molecule always formed between two similar atoms?

Why sodium chloride is a solid whereas carbon tetrachloride is a liquid?

Why NaCl gives a white percipitate with AgNO₃ solution but CCl₄ does not?

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Chemical Bonding And Molecular Structure

What do you understand by bond order? How is it related with bond length and bond energy? Explain on the basis of bond order that He2 molecule does not exist.

Some More Questions From Chemical Bonding and Molecular Structure Chapter

Write Lewis dot symbols for atoms of the elements Mg, Na, B, O, N, Br.

Draw the Lewis structure for the ionic compound by aluminium and fluorine.

Two elements A and B have the electronic configuration as:A = 1s22s22p63s2 and B = 1s22s22p5Write the empirical formula of the substance containing A and B.

What type of bonding would you expect between:(i) a metal and a non-metal(ii) a non-metal and another non-metal?

Give reasons in one or two sentences for the observation that in their compounds non-metals form anions and not cations.

Out of Na and K, which will form a more stable ionic bond?

Which will have a greater lattice enthalpy: NaCl or MgO?

Is a covalent molecule always formed between two similar atoms?

Why sodium chloride is a solid whereas carbon tetrachloride is a liquid?

Why NaCl gives a white percipitate with AgNO3 solution but CCl4 does not?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

What do you understand by bond order? How is it related with bond length and bond energy? Explain on the basis of bond order that He₂ molecule does not exist.

Two elements A and B have the electronic configuration as:
A = 1s²2s²2p⁶3s² and B = 1s²2s²2p⁵Write the empirical formula of the substance containing A and B.

What type of bonding would you expect between:
(i) a metal and a non-metal
(ii) a non-metal and another non-metal?

Why NaCl gives a white percipitate with AgNO₃ solution but CCl₄ does not?