They are neutrons, protons and electrons.
Because they are particles, and they are part of the atomic structure.
Sub-atomic particles are even smaller particles that make make an atom
Depends on 'what' particles: sand particles are, and atomic particles are not!
electrons
Atomic, and subatomic particles go to different atomic, and subatomic particles.
Atomic particles are too small to be easily observed directly.
I have never heard of a "table of atomic particles". Are you referring to the periodic table of elements?
atomic nucleus
Sub-atomic particles to be exact. But yes they are.
A chlorine-35 atom has 17 protons, 17 electrons and 18 neutrons, altogether 52 atomic particles. Chlorine-37 has two more neutrons and it has 54 atomic particles.
Atomic Mass Unit (amu)
Atomic mass unit