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Chemical Bonding and Molecular Structure
What causes the two atoms to combine to form a bond which is:
(i) Non-polar
(ii) Polar-covalent and
(iii) Ionic in nature?
The nature of the bond between the two atoms depends on upon the electronegativity difference in them.
(i) If the two atoms are identical or have the same electronegativity (C and S), the bond is of non-polar nature.
(ii) If the two atoms differ in electronegativity, but the difference is less than 1 -9, the bond is mainly polar covalent with little ionic character. For example, the bond between carbon and chlorine.
(iii) If the difference in electronegativity of two atoms is more than 1 -9, the percentage ionic character is more than the percentage polar covalent character. Larger the electronegativity difference, greater will be the ionic character. For example, the bond between sodium and fluorine is completely ionic.
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What is crystal lattice?
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?
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