47.0 gram piece of brass is 22% tin and 78% copper what is the Mass(g) of copper in the piece

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

1. list three scientific reasons cockroaches may fly.

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two