From Uranium 238 to Lead 206
This diagram maps the journey on a nucleus map of the uranium 238 decay chain. The alpha decays cause the number of protons and neutrons to diminish by 2, whereas beta-negative decay diminishes the number of neutrons by 1 and increases the number of protons by 1. The instability caused by the alpha decay is corrected by the eventual beta decay, leading to the stable nucleus of lead 206, with its 82 protons and 124 neutrons.