Like how can there be an anti-particle for a neutron, if it has no charge? And can there be an “anti-person” that’s made purely of antiparticles (positrons and antiprotons)?
In: Physics
>Like how can there be an anti-particle for a neutron, if it has no charge?
So neutrons and protons are actually made up of *quarks* and those are what have charge. There’s 6 types of quarks but the only two that matter right now are the “up” and “down” quark.
An up quark has a charge of +2/3 and a down is -1/3.
A normal proton is 2 ups and 1 down. For a total charge of 1 (2/3+2/3-1/3)
A normal neutron is 1 up and 2 down. For a total charge of 0 (2/3-1/3-1/3)
But there’s also *anti-quarks.* Which have the opposite charge of their pair.
So an antineutron is made up of 1 anti up (-2/3 charge) and 2 anti-downs (+1/3 charge). Which indeed does give it a charge of zero again.
But like… -0 is still a thing. It just happens to also equal positive zero. Which is a weird quirk of the number zero.
>And can there be an “anti-person” that’s made purely of antiparticles (positrons and antiprotons)?
We don’t know for certain. We have observed such a small amount of anti matter that we don’t know a lot about it’s properties. Infact, we don’t even know if gravity affects anti-matter the same way. We assume it does, but we aren’t certain.
With that out of the way to answer the question in the title.
No, not *everything* has an anti-particle but everything that makes up “normal” matter does. Wikipedia has an article that’s a [list of particles](https://en.wikipedia.org/wiki/List_of_particles) (if it says “self” for anti-particle that means it don’t got one). The most “famous” particle that doesn’t have an anti-particle would be the photon.
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