Visualizations that show the shapes students have to invent
Rings and colored tiles get you through a first exam. However, they fail at orbitals, packing fractions, and why helium sits where it does. These pages supply the missing pictures. You get hydrogen’s real ψ, electrons filling all 118 configurations, VSEPR shapes with visible lone pairs, unit cells you can explode, a Kelvin slider through melting, four maps of the 118, the valley of nuclear stability, and a workbench of known molecules.
Probability clouds
Hydrogen orbital shapes
s, p, and d clouds from the actual hydrogen wavefunction — not Bohr rings.
Open the 3D orbital cloudQuantum numbers
Quantum numbers n, ℓ, m
n and ℓ pick the subshell; m (or a real ±m mix) picks the orientation. Nodes follow from those integers.
Table architecture
s, p, d, and f blocks
The table’s shape is the filling order of s, p, d, and f orbitals, drawn as a map.
Trend landscape
Periodic trend topography
118 bars on the real table grid. Height and color are the property — watch electronegativity invert into radius.
Solid-state packing
Crystal lattices & packings
FCC, BCC, HCP, and diamond cubic — clip the spheres at the faces and count the fractions.
Kinetic theory
States of matter
A Kelvin slider from 0 K to 6000 K. Atoms rattle, slip, then fly — switched at this element’s melting and boiling points.
Table forms
Periodic table layouts
18-column, 32-column, Benfey’s spiral, and ADOMAH / n+ℓ — the tiles tween; helium’s jump is the argument.
Element blender
Molecule sandbox
2 H + O is water at 104.5°. This bench is a recipe book parsed as PDB, not a quantum-chemistry engine.
Aufbau principle
Electron configuration
Orbital boxes stacked by energy. Press Play and watch Aufbau, Pauli, and Hund build all 118 elements — and break the rule at chromium.
Molecular geometry
VSEPR molecular shapes
All 13 shapes from linear to square planar. Lone pairs are visible lobes, and they squeeze water down to 104.5°.
Isotopes & decay
Band of stability & isotopes
About 4,800 nuclei on an N–Z grid. β⁻ on one wall, β⁺ on the other, α at the heavy end — and iron at the top of the binding curve.