Particles that are heavy. Mass is like MASSive (massive) and massive objects could be heavy.
All subatomic particles have mass.
The amount of particles in the object. The more particles, the bigger the mass.
Mass is an extensive property. Because it depends upon on no of particles. No particles changes mass changes.
These particles are protons and neutrons; but to be correct the mass of electrons must be added.
the electron particles make up the mostr mass
By particles, I assume you mean atoms. Firstly, you divide mass by molecular mass to get moles. Then multiply moles by avagadros number to get amount of atoms
Zero.
AMU (Atomic Mass Unit) is the SI masses of particles for nucleus.
The mass is the number of particles. Especially with atoms on the periodic table. The atomic mass is the number of proton and neutrons in the nucleus.
These particles are the protons and neutrons.
Atomic Mass Unit (amu)
Light 'particles' (photons) have no rest mass.