It's not accurate to say there are only three properties of subatomic particles. There are many properties that define and characterize subatomic particles. However, three of the most fundamental and commonly considered properties are:

1. Charge: This refers to the electrical charge carried by the particle. It can be positive, negative, or neutral.

* Protons: Positively charged

* Neutrons: Neutrally charged

* Electrons: Negatively charged

2. Mass: This describes the amount of matter contained within the particle. It is typically measured in atomic mass units (amu).

* Protons and neutrons have approximately the same mass (1 amu).

* Electrons have a much smaller mass (approximately 1/1836 amu).

3. Spin: This property is a bit more abstract and relates to the intrinsic angular momentum of the particle. It is quantized, meaning it can only take on specific values. Spin is often described as "up" or "down."

While these three are crucial, other important properties of subatomic particles include:

* Lepton number: A conserved quantity for leptons (e.g., electrons, muons).

* Baryon number: A conserved quantity for baryons (e.g., protons, neutrons).

* Flavor: A property that distinguishes different types of quarks.

* Color charge: A property related to the strong nuclear force.

So, while charge, mass, and spin are essential, there are many other characteristics that contribute to our understanding of the vast and complex world of subatomic particles.