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.
Free Atomic & Molecular Calculators
8 toolsAtomic mass, electron configuration, bond order, and crystal structure calculators. Browse our free atomic & molecular tools below — no sign-up required.
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.