[melissajohn718]

does an electron have both wave and particle properties? or only wave or only particle?

[Kyle1990]

it has both: consider the interference phenomenon of light when passed through two slits. The light produces constructive and destructive interference, resulting in bright spots and dark spots. Interference is a property of waves.
Now consider the photoelectric effect. At a certain threshold frequency, an electron is emitted from the surface of a metal, and is considered a particle. It depends on the experiment whether or not it behaves like a wave or particle.

[Astrokel]

I am not exactly good at physics, my teacher mentioned both wave and particle properties of matters cannot co-exist simultaneously, like Kyle1990 had said, it depends on the experiment, so yes it has both wave and particle properties but cannot exhibit at the same time.