Bohr:Lab

nucleus · shells · electrons

Set the nucleus, add shells, then drag the red electrons onto them. Tap ? for help.

Protons p⁺

0

Neutrons n⁰

0

Shells rings

0

Electrons e⁻

0

Background

Build-a-Bohr, in four moves

Load the nucleus. Dial in protons (p⁺) and neutrons (n⁰) with the steppers.
Add shells. Give your atom up to four electron shells.
Drop electrons. Bump the electron count, then drag each red electron onto a shell — 2 in the first, then 8, then 8…
Copy it. Hit Copy image and paste your atom straight into a doc, slide, or quiz.

Neat freak? Flip on Snap to shells to click electrons into tidy positions, toggle e⁻ labels to name them, and set Background → Clear to copy a see-through model. Snapping tidies placement — it never decides how many go on each shell.