"Negatron" is not a standard term in physics. It's likely a synonym for electron, which is a subatomic particle found in atoms.

Here's why:

* Electrons: These are negatively charged particles that orbit the nucleus of an atom. They are fundamental particles, meaning they are not made up of smaller components.

* Negatively charged particles: The term "negatron" might be used in older texts or non-standard contexts to refer to negatively charged particles.

So, while "negatron" isn't a commonly accepted term in modern physics, it essentially refers to an electron, which is indeed a subatomic particle found in atoms.