Particles of matter, such as atoms and subatomic particles, have a few important characteristics:

1. Mass: Particles have weight and take up space. The more matter a particle contains, the greater its mass.

2. Charge: Particles can carry electrical charge, which can be positive, negative, or neutral. Charges interact with each other, causing attractions or repulsions.

3. Size: Particles have a physical size or dimension. Some particles are tiny, while others are larger. The size of particles can affect how they interact with other particles.