16. It is neutral.
17. It is positively-charged.
18.It is negatively-charged.
19. It revolves around the nucleus.
20. It is found in the nucleus of an atom.
21. It is responsible for the mass of an atom.
24. IC IS Discovered by I. i nomson.
23. It is discovered by Ernest Rutherford.
24. It is discovered by James Chadwick.
25. The lightest subatomic particles.​