Atomic mass, electron configuration, bond order, and crystal structure calculators. Browse our free atomic & molecular tools below — all calculators are instant, accurate, and require no sign-up.
Atom Calculator — Explore atomic structure: find protons, neutrons, electrons, mass number, and isotope notation for any element. Includes ion charges, isotope data, and periodic table reference.
Atomic Mass Calculator — Look up atomic masses for all 118 elements. Calculate formula masses, convert between amu and grams, and explore mass defect and nuclear binding energy.
Average Atomic Mass Calculator — Calculate the weighted average atomic mass from isotope masses and abundances. Supports 2-6 isotopes with automatic normalization and visual abundance charts.
Bond Order Calculator — Calculate bond order from molecular orbital theory. Enter bonding and antibonding electrons, view MO diagrams, bond type, magnetic properties, and comparison tables.
Cubic Unit Cell Calculator — Calculate density, packing efficiency, atomic radius, and cell parameters for simple cubic (SC), body-centered cubic (BCC), and face-centered cubic (FCC) unit cells.
Electron Configuration Calculator — Generate electron configurations for all 118 elements. Shows orbital filling, noble gas core notation, orbital diagrams, valence electrons, and quantum number sets.
Electronegativity Calculator — Compare electronegativity values across Pauling, Mulliken, and Allred-Rochow scales. Predict bond polarity, bond type, and dipole moments from electronegativity differences.
Lattice Energy Calculator — Calculate lattice energy using the Born-Landé equation. Compare ionic compounds, explore Madelung constants, and understand crystal energetics with the Born-Haber cycle.