important ques...

Asked by newlearner1 | 4th Aug, 2009, 05:02: AM

Expert Answer:

Limitiations of octet rule:

1.  It was based on chemical inertness of noble gases.But some nobel gases like Xenon combines with oxygen and fluorine to form compounds.

2. It does not predict the shapes of compounds.

3. Some compounds like BCl3, BeH2 have incomplete octet of the central atoms B and Be.

4. Some molecules are odd electron molecules like NO and NO2

5. In some molecules, ceontral atom has more than 8 electrons like SF6, PCl5.

Factors affeacting ionic bonding:

An ionic bond is formed when one of the atoms have a tendency to lose electrons that is it has 1,2, or 3 electrons in the valence shell and the other atom has a tendency to accept electrons that is it has 5,6,or 7 electrons in the valence shell. The ionic bond is formed by the transfer of electrons from the atom which can donate electrons to the atom whic has the tendency to accept electrons.

 

 

Answered by  | 4th Aug, 2009, 11:29: AM

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