An atom is 1. _____________ in shape. It has three subatomic particles namely, the electrons, protons, and neutrons. A proton possesses 2. _____________ charge. On the other hand, an electron is 3. _____________ charged while neutron is said to be 4. _____________. The lightest among the subatomic particles is the 5. _____________ while the heaviest is the 6. _____________ . Electrons can be found 7. _____________ the nucleus while the protons and neutrons can be found 8. _____________ in the nucleus. The nucleus is the 9. ____________ part of the atom. The charge of the nucleus is 10. _____________.
