A particle called the pi-meson is made from an up quark and an antidown quark. What is the charge of this particle?

Positive Pion, Negative Pion and Neutral Pion

Explanation:

Pi-meson or also known as pion is one of any of the three (3) subatomic particles which characterizes of being unstable of its nature. The charged pions

π+

and

π-

decay with a mean lifetime of 26.033 nanoseconds or 2.6033*10-8 seconds, and the neutral pion

π0

decays with a mean lifetime of 84 attoseconds (8.4*10-17 seconds).