Across
- 3. Scientist that developed the current model of the atom with electron shells
- 4. Radioactive particle with 2 protons and 2 neutrons
- 5. Positively charged particle of an atom
- 9. A positive ion
- 11. Describes an unstable isotope that releases radiation
- 14. Negatively charged particle of an atom
- 17. Scientist who developed the plum pudding model
- 19. Substance made up of 2 or more different elements
- 20. A negative ion
- 21. Horizontal row of the periodic table
- 22. The kind of electric charge generated by protons
- 24. When an unstable isotope converts into its stable form by releasing radiation
- 26. Outer region of an atom containing the electrons
- 27. Neutrally charged particle of an atom
Down
- 1. Vertical column of the periodic table
- 2. The identification of an illness by a medical professional
- 3. Produced when a neutron turns into a proton and an electron
- 6. A type of medicine used to try cure a disease or illness
- 7. Outer most electron shell
- 8. Scientist who did the gold foil experiment
- 10. Emitted when the nucleus is still excited after previous emissions
- 12. H2O
- 13. An atom with more or less neutrons than normal
- 15. The kind of electric charge generated by electrons
- 16. Part of an atom in the middle containing protons and neutrons
- 18. An atom with more or less electrons than normal
- 23. Pure substances that cannot be broken down into anything other substance
- 24. Scientist who discovered the link between elements and atoms
- 25. The smallest part of a chemical element