Atomic Theory

5. This number shows the number of electrons in an atom
7. Electrons change this level as they gain or lose energies
8. The most stable electron configuration
11. This exists because an atom can have different number of neutrons
13. The man who created the Gold Foil experiment and theorised that all of an atom's positive charge is concentrated in its nucleus
14. Name of the person who proposed that all elements are composed of atoms

1. This relationship between elements in compounds is always the same
2. This shows the most likley locations for electrons in an atom
3. This man's experiments provided the first evidence that atoms are made of smaller particles
4. The negatively charged particle in an atom
6. James Chadwick designed an experiment to show that these exist
9. This man's experiments focussed on electrons and their positions
10. The positively charged particle in the nucleus
12. This is the region of space around the nucleus where an electon is likley to be found