What is octet rule?

Which one of the following violates octet rule ?

According to Octet Rule, each atom gains or loses electrons to complete its outermost shell. As a result, molecules are formed. Each contributing element has 8 electrons in the outermost shell, but there are some limitations to this rule in which central atom of some molecules has more han 8 electrons. Some molecules like NO and NO_(2) don't satisfy octet rule as they have odd electrons in them. On the basis of above paragraph, answer the following : (i) Writer the Lewis structurre of N_(2) molecule. (ii) How the structure of SF_(6) cannot be explained on the basis of octet rule ?

Fill in the blank by using correct word/term given in the bracket and rewrite the complete sentence in your notebook. The atoms combine to have __________ electrons in their valence shells is the octet rule. (eight/eighteen)

What are Sidgwick's views regarding the failure of the octet rule?

Give some examples which illustrate the failure of the octet rule. What explanations have been suggested to explain the failure of the octet rule?

Molecule which follows octet rule

Explain : octet rule for formation of a chemical compund.

Which of the following does not follow the octet rule ? .

Which one of the following exceeds octet rule ?

In which of the following molecules does the central atom not follow the octet rule?