A neutron
Neutron
nobody split the quark, it is a fundamental particle
An atom. An atom can be split into smaller pieces, but if you do that, you no longer have the same element.
An atomic pile, or more correctly a nuclear pile, uses Uranium235 as the fuel. This isotope of uranium has the property that the nucleus can be split (fissioned) when a slow neutron enters it, and in the fission process more neutrons are emitted together with heat energy, and the formation of fission products which are other elements. Therefore a self perpetuating chain reaction can be started. The neutrons emitted by the fissions are fast and have to be slowed down by the moderator which can be graphite, heavy water, or light water. The rate of fissions is adjusted with control rods which absorb neutrons, or by other neutron absorbing means, so that a steady power level is achieved.
Generally this is called nuclear fission. In the special case where one of the new particles produced is a Helium-4 nucleus (2 protons, 2 neutrons) the process is radioactive decay and specifically alpha emission. (The He-4 nucleus is called an alpha particle, as it was the first such particle recognized. A beta particle is an electron emitted from the nucleus with the conversion of a neutron to a proton = beta emission.)
It is possible to photoactivate any nucleus except 1H. Be really hard to do, but possible. Light (a Photon) is a "massless" sub-atomic particle (Boson) that has no atomic structure / any structure is sub-atomic; IE: No "Atom, proton, neutron, electron" etc. Because of this it is not an "Atom" and cannot be split. Photon's can be 'cloned' which some term as splitting, however they are not really split as there is nothing to split. Photon's interact with charged electrons and clone themselves into lower frequencies, putting white light through a prism results in bands of colored light (lower frequencies).
nobody split the quark, it is a fundamental particle
Atomic energy is produced when atoms of uranium235 or other fissile material split, or undergo fission. It is nothing to do with fluorescence, and I don't understand 'heat mass'
a proton and an electron
a free neutron can trigger the split of a particle like uranium 238. It will produce a smaller atom (eg. proctantium), a beta particle and energy.
process by which a target nucleus can be split into two smaller nuclei upon bombardment
Nuclear energy is released when uranium or plutonium nuclei are fissioned (split). Not clear what you mean by "particle", but nuclear energy only comes from a nuclear process, not a mechanical or chemical one.
You cannot see a black hole when you are on Earth, unless a black hole were to absorb Earth, which even then, you would see it in a split-second before it would engulf you
Two neutrons and two protons will split off from the main nucleus as the alpha particle, leaving a different element.
As far as we know: no. An electron is a fundamental particle, which means it cannot be split into anything else.
The large amount of energy imparted upon it in a particle accelerator.
Probably you think at fission products.
An atom. An atom can be split into smaller pieces, but if you do that, you no longer have the same element.