Question

Define octet rule. Write its significance and limitations.​

Answer 1

Answer:

The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

Answer 2

Answer:

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Define octet rule. Write its significance and limitations.

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Octet rule

✔️ The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell.

✔️ When atoms have fewer than eight electrons, they tend to react and form more stable compounds.

✔️ It was postulated by Kossel & Lewis. The atoms complete their octet by either loosing or gaining of electrons.

✔️ They do so to attain the nearest noble gas stable electronic configuration .

Limitations :–

✔️ The main limitation to the rule is hydrogen, which is at its lowest energy when it has two electrons in its valence shell. Helium (He) is similar in that it, too, only has room for two electrons in its only valence shell.

✔️ Second limitation are aluminum and boron, which can function well with six valence electrons.

✔️ In Period 3, the elements on the right side of the periodic table have empty d orbitals. The d orbitals may accept electrons, allowing elements like sulfur and phosphorus to have more than an octet..

✔️ The octet rule is not satisfied for all atoms in a molecule having an odd number of electrons. For example, NO and NO2

Significance :–

✔️ The octet rule successfully explains the formation of chemical bonds depending upon the nature of the element.

✔️ It is used to determine stability in atoms.