Octet Rule and Its Exceptions
The octet rule states that atoms tend to form bonds to achieve eight electrons in their valence shell, with notable exceptions such as incomplete octets, expanded octets, and odd-electron species.
Why this shows up in the exam
NEET and JEE often test your ability to identify exceptions and apply the octet rule to predict molecular stability.
How NEET tests this
Practise it
These are real questions from past NEET papers that test this exact idea.
Which compound is electron deficient?
More from Chemical Bonding and Molecular Structure
Molecular Orbital Theory
Molecular Orbital (MO) Theory explains bonding in molecules by combining atomic orbitals to form molecular orbitals, predicting bond order, magnetism, and stability.
Hybridization and Molecular Shape
Hybridization describes the mixing of atomic orbitals to form new hybrid orbitals, determining molecular geometry and bond angles.
VSEPR Theory and Molecular Geometry
Valence Shell Electron Pair Repulsion (VSEPR) theory predicts molecular shapes based on electron pair repulsions around the central atom.
Isoelectronic and Isostructural Species
Isoelectronic species have the same number of electrons, while isostructural species share the same molecular geometry.
Bond Length, Bond Order, and Related Properties
Bond order indicates the number of chemical bonds between a pair of atoms, influencing bond length, strength, and stability.
Sigma and Pi Bonds
Sigma (σ) and pi (π) bonds are types of covalent bonds formed by different orbital overlaps, affecting molecular structure and reactivity.