What is the most unstable subatomic particle?

There are three commonly referred to subatomic particles, the proton, the neutron, and the electron. Inside of the atom itself, all three are stable. However, as free particles, only protons and electrons are stable.

Neutrons are radioactive and decay with a half-life of around 15 minutes Edit: Although those are the three most common particles, there are several others (e.g. : Delta Particle, Lambda, Upsilon, etc. ) made of different types of quarks besides Up and Down (two U and one D make a proton, two D and one U make a neutron) and have charges of 2/3 and -1/3, respectively. The general rule of thumb is if a particle has more massive constituents then it will be more unstable than a particle with less massive constituents.

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