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

Steric number

Steric number: bonded atoms plus lone pairs.

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

Hybridization

The resulting hybridization 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.

• VSEPR Geometry Lookup

  Look up the VSEPR molecular geometry from the number of bonded atoms and lone pairs on a central atom.

• Coordination Number Calculator

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

• 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.