Electrons are drawn in simple shells (2, 8, 8, 2), a handy picture rather than real orbitals. The nucleus is drawn thousands of times too large. Stability data cover hydrogen to calcium.
Each alpha particle is scattered by one nucleus, using Rutherford's formula: the closer it passes, the larger the angle, and a bigger nuclear charge (Z) scatters more. Bars use a log scale so rare large angles stay visible. Rates are simplified (thin foil, single scattering).
The worked solution animates after a correct answer or when you ask for it: the set-up builds term by term and units cancel with a red strike.
Your job
Drag a card onto a box, or tap a card and then tap the box's name. Cards are buttons, so Tab and Enter work too. Each correct card lights up on the periodic table above.
Wrong picks are fine here. Each one tells you why.