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

Crystal structure

Lattice arrangement of the ionic crystal.

Look up the electrostatic Madelung constant for common ionic crystal structures. 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]

Madelung constant

Dimensionless Madelung constant of the lattice.

• Crystallographic calculations assume the stated ideal lattice, indexing, wavelength, occupancy, and unit-cell geometry. Defects, strain, texture, thermal expansion, mixed phases, and instrumental corrections are outside the compact model.
• 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.

• 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.

• Acentric Factor Lookup

  Look up acentric factor omega of a common substance.

• Coordination Number Calculator

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