Can someone pls help me with science I will mark brainliest

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Ways that industry and agriculture use physical properties to separate substances