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Chemical Bonding and Molecular Structure
What is a linear combination of atomic orbitals (LCAO) far obtaining molecular orbitals ?
Molecular orbitals are formed by the combination of atomic orbitals. On combining two atomic orbitals, we get two molecular orbitals; one molecular orbital with lower energy is called bonding molecular orbital and its wave function is obtained by the linear addition of wave function and ΨA and ΨB of bonded atoms A and B.
ΨMO = ΨA + ΨB (Bonding MO)
The other molecular orbital with higher energy is called antibonding molecular orbital and its wave function is obtained by linear subtraction of wave functions of ΨA and Ψ B of atomic orbitals.
ΨMO = ΨA – ΨB (Antibonding MO).
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What is electrovalency?
What bond is present in MgCl2 molecules?
Two elements A and B have the electronic configuration as:
A = 1s22s22p63s2 and B = 1s22s22p5
Write 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?
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