2.The positive particles of an atom are

3. The central region of an atom where its neutrons and protons are is its_________

4. electrons have this type of charge?

5.Who discovered the electron?

6.which subatomic particles in the atom have no charge (they are neutral)?

7 smallest part of an element that has all of the properties of that element.

9.Who stated that atoms cannot be divided?

10.In an atom, electrons move in definite orbits around the nucleus.

What is the atomic number of chlorine?

How many protons are there in an atom of aluminium?