Lone pair
Topology (electrical circuits)
Charge density
Valence (chemistry)
Chemistry
Ammonia
Ab initio
Ion
Crystallography
Formal charge
Ab initio quantum chemistry methods
Metal
Nuclear quadrupole resonance
Spectral line
Inorganic chemistry
Computational chemistry
Molecule
Nuclear magnetic resonance
Physics
Mathematics
Organic chemistry
Combinatorics
Quantum mechanics
Astronomy
