Where electrons live
The orbiting-planet picture of the atom collapses in ten picoseconds. What replaces it: standing waves, quantized energies, and electron clouds you can rotate with your mouse.
The filling order
With many electrons, three seating rules decide who goes where. Watch the energy ladder's rungs drift and cross as the nucleus grows, and see exactly why 4s fills before 3d.
The table is a map
The periodic table's odd shape is the filling order made visible. Build it row by row, then watch one number, the pull felt by outer electrons, drive every trend across it.
One continuum, not three bonds
Covalent, polar, ionic: textbooks present three kinds of bond. There is one, with a dial. Drag the tug-of-war and morph a shared electron cloud into a full transfer.
Building molecules
Valence electrons become a notation, the notation becomes a tool. Assemble real molecules dot by dot, with the octet rule checking your work.
Shapes & stickiness
Why molecules take 3D shapes (electron domains shoving each other), and why water is so strange (hydrogen bonding). Coming next.