Rutherford and the Nuclear Atom

What happened

In 1911, from experiments firing alpha particles at thin gold foil, Ernest Rutherford deduced that the atom is mostly empty space, with nearly all its mass and positive charge packed into a tiny central 'nucleus.' Later he became the first to deliberately split a nucleus, transmuting nitrogen into oxygen.

Why it matters

Rutherford's nuclear atom is the picture we still carry today — a dense nucleus orbited by electrons — and it founded nuclear physics. His work opened the path to Bohr's quantum atom and, eventually, to nuclear energy.

Sources

• The Nobel Prize. Ernest Rutherford – Biographical (Nobel Prize in Chemistry 1908) · Reputable source