A particle that has mass and a positive electrical charge is called a proton.

Here's why:

* Mass: Protons have a mass of approximately 1 atomic mass unit (amu), which is about 1.6726 × 10^-27 kg.

* Positive Charge: Protons carry a single positive charge, which is equal in magnitude but opposite in sign to the charge of an electron.

Protons are fundamental particles found in the nucleus of atoms.