Here's a breakdown:

* Negative Charge: Electrons have a fundamental negative charge.

* Quantum Properties: Electrons also exhibit quantum properties, meaning they behave like both particles and waves. They have specific energy levels within an atom and can jump between those levels.

* No Mass (Relatively): Electrons have a very small mass compared to protons and neutrons, so their mass is often considered negligible in atomic calculations.

Let me know if you'd like to explore other aspects of electrons in atoms!