Atomic Theory Crossword

6. Atoms that possess different numbers of protons are called ___________.
8. How electrons are organized around a nucleus.
10. The number of protons in an atom (also the number of electrons).
12. Argued in favour of the plum pudding model.
14. An atom is mostly ____________.
16. The charge on a neutron.
17. Charged particle in the nucleus.
18. Thought that the world was built from small atoms which could not be broken - Greek.
21. Created the atomic model with electrons in shells.

1. Described atoms as the smallest building block of matter - not Greek
2. Particles that orbit the nucleus
3. The building blocks or all matter - can still be broken down into smaller particles though.
4. The charge on an electron.
5. Model of an atom that saw electrons embedded inside a positively charged field.
7. The particle that helps to holds proton in the nucleus.
9. An element that possesses one proton and one electron.
11. Disproved the plum pudding model of an atom.
13. An element that possesses two protons and two electrons, and two neutrons.
15. The charge on a proton.
19. This is released in large amounts when a nucleus in broken apart.
20. Meaning smaller than an atom.