Stone to Silicon

Math & science · 1913

Bohr atom

Bohr puts electrons in quantised orbits and explains hydrogen's spectral lines.

The model predicted the Balmer series from fundamental constants. It was the bridge from Planck's quantum to full quantum mechanics.

See it in the living treeWikipedia

Arcs above join it to what it stood on, arcs below to what it led to. The bar places this stretch on the tree's whole timeline.

What it built on 3

What it led to 2