Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Bonded atoms

Atoms bonded to the central atom.

Lone pairs

Lone pairs on the central atom.

Look up the VSEPR molecular geometry from the number of bonded atoms and lone pairs on a central atom. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Geometry

The resulting geometry returned as a string.

• Bond, orbital, and structure rules are simplified representations. Resonance, relativistic effects, electron correlation, molecular geometry, oxidation state, and the measurement or computational method affect tabulated and predicted values.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Hybridization Lookup

  Look up the orbital hybridization of a central atom from its steric number (bonded atoms plus lone pairs).

• Ionic Radius Lookup

  Look up a Shannon effective ionic radius for a common six-coordinate ion; ionic radius depends on oxidation state and coordination number.

• Coordination Number Calculator

  Look up the number of nearest neighbours around an atom for the common cubic and close-packed structures.