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Chemical Bonding and Molecular Structure
Discuss the formation of compounds in which octet rule is violated.
There are some exceptions to the octet rule:
(i) Formation of compounds like BeCl2, BF3 AlCl3 etc. In each of these molecules, the central atom (Be, B or Al) has less than 8 electrons i.e. these are electron deficient compounds.
(B and Al have 6 electrons around them.)
(ii) Formation of compounds like PCl3, SF6, IF7 etc. In each of these molecules, the central atom has more than 8 electrons.
The octet rule is violated in these molecules.
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What are 'Lewis structures'?
Name the conditions for the formation of an ionic bond between two atoms.
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.
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