Atomic Structure & Periodic Table

Build atoms and read the periodic table interactively: write electron configurations for Z = 1–36, compare isotopes with a mass spectrometer, explore trends in atomic radius, electronegativity and ionisation energy, and replay Rutherford's gold-foil experiment.

11 interactive Chemistry simulations on atomic structure & periodic table.

Periodic table structure – cells, periods and groups Chemistry · Atomic Structure & Periodic Table An interactive periodic table: click a cell to see its atomic number, electron configuration, period and group, and... Ages 15–16
Electron Configuration – Atoms Z = 1–36 Chemistry · Atomic Structure & Periodic Table Pick an element on the mini periodic table and watch its electrons fill the shells (Bohr model) and orbital boxes... Ages 15–16
Isotopes and atomic mass – mass number, abundance and average atomic mass Chemistry · Atomic Structure & Periodic Table Choose an element, then drag neutrons into or out of the nucleus to build its isotopes (Z ≤ 10) and see the mass... Ages 15–16
Models of the hydrogen atom – light and spectra Chemistry · Atomic Structure & Periodic Table Fire photons (white light or a single chosen wavelength) at a hydrogen atom: the Experiment tab gives the measured... Ages 15–16
The Mole, Molar Mass and Avogadro's Number – Counting Particles by Weighing Chemistry · Atomic Structure & Periodic Table Put two samples on a balance (elements, water, table salt, limestone, table sugar), compare equal masses or equal... Ages 15–16
Ionization energies and photoelectron spectra Chemistry · Atomic Structure & Periodic Table A log-scale chart of the successive ionization energies of any element from H to Ca shows the big jump when an... Ages 15–16
3D Quantum Numbers and Atomic Orbitals in 3D – s, p, d Chemistry · Atomic Structure & Periodic Table Choose the four quantum numbers n, l, mₗ and mₛ and view the s, p and d orbitals of the hydrogen atom in three... Ages 15–16
Mass spectrometer – isotopes and relative atomic mass Chemistry · Atomic Structure & Periodic Table A simulated mass spectrometer: atoms are ionised, accelerated, deflected in a magnetic field according to m/z and... Ages 15–16
Rutherford scattering – alpha particles, the nucleus and the Thomson model Chemistry · Atomic Structure & Periodic Table Fire a beam of alpha particles at an atomic nucleus and follow the paths curved by Coulomb repulsion: most particles... Ages 15–16
Periodic trends (atomic radius, electronegativity, ionisation energy) Chemistry · Atomic Structure & Periodic Table The first 36 elements of the periodic table are shaded or sized by atomic radius, Pauling electronegativity, first... Ages 15–16
3D Community Empirical and Molecular Formula Calculator Chemistry · Atomic Structure & Periodic Table Determine empirical and molecular formulas step-by-step from percentage composition and experimental molar mass....