This particle is the neutron.
In the atom the heaviest particle is the neutron but the proton is close.
Protons and neutrons are roughly 1800 times heavier then electrons.
Neutrons are... very slightly... more massive than protons.
Uranium atom is the heaviest.
I suppose that hadrons are the heaviest.
The basic building blocks of the atom are neutrons, protons and electrons. Of these, the neutron is the more massive. But it's only a tiny bit more massive than the proton. This is a great place to begin to unlock the mysteries of the atom. A link to our friends at Wikipedia is provided.
A neutron.
The heaviest atom known today is 294Uuo, an isotope of ununoctium.
The smallest particle of an element is called an atom.
An atom is a particle, the smallest particle that can exist by itself.
Yes, a particle can be a single atom.
The heaviest subatomic particle is the neutron: 1.00866491600(43) amu.