Final answer:
The octet rule is a guideline that applies to all elements other than noble gases. It explains the tendency of atoms to bond in a way that each atom has eight valence electrons, similar to the electronic configuration of a noble gas. However, there are exceptions to the octet rule.
Step-by-step explanation:
The octet rule is a chemical rule of thumb that reflects the observation that 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. It is a guideline that applies to all elements other than noble gases. Atoms can achieve an octet of electrons by sharing, losing, or gaining valence electrons.
However, there are exceptions to the octet rule, such as hydrogen and helium, which have different electron configurations. Overall, the octet rule helps explain the tendency of atoms to form stable compounds with eight valence electrons.