The largest. Uranium and the trans-uranium atoms are the most massive.
Uranium atom is the heaviest.
The heaviest atom known today is 294Uuo, an isotope of ununoctium.
The heaviest part of an atom is its nucleus which contains the atoms proton(s), and possibly nuetrons. Protons are approximately 10000 times heavier than the electrons in an atom which occupy the electron cloud surrounding the atom.
This particle is the neutron.
The nucleus of an atom is the heaviest part and contains most of the atom's mass. It is made up of protons and neutrons. Electrons, which orbit the nucleus, have much less mass compared to protons and neutrons.
The most mass of a atom is located in the nucleus, where the protons and the neutrons are located.
In the atom the heaviest particle is the neutron but the proton is close.
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Heavy Duty.
The type of tractor trailer that can hold the heaviest loads is a Semi-Trailer truck. This is the heaviest truck that is allowed on the roads.
The heaviest atom would be an atom of element 118, which has 7 energy sublevels because it has 7 electron shells (n=1 to n=7). Each shell can contain multiple sublevels of different shapes (s, p, d, f) which can accommodate a certain number of electrons.
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.