Across
- 2. type of mixture that is the same throughout
- 3. can be beaten into different shapes
- 4. the French scientist who developed the law of conservation of mass
- 7. ________ number shows the number of protons + neutrons
- 8. the negatively charged particle outside the nucleus of an atom
- 11. the atomic _______ says atoms are made of one type of atom
- 12. he thought atoms were made of only one type of atom
- 15. matter with the same composition throughout
- 18. thought electrons moved like planets around the sun
- 20. the uncharged particle in the nucleus
- 21. a chemical combination of more than one element
- 24. used gold foil in his experiment
- 25. discovered the electron
- 28. the category of elements made of mostly gases
- 31. electrons move randomly in energy levels within the electron ________
- 32. discovered the proton
- 34. atoms of the same element with a different number of neutrons
Down
- 1. the category of elements that are shiny, malleable, and ductile
- 5. small particles that make up matter
- 6. matter made of one type of atom (starts with "e")
- 7. a physical combination of different elements
- 9. the first person to use the term "atom"
- 10. discovered the nucleus
- 13. shininess
- 14. anything that has mass and takes up space
- 16. elements are arranged on the periodic _______
- 17. used the cathode ray tube
- 19. type of mixture that is not the same throughout
- 22. matter cannot be created or ______.
- 23. the positively charged particle in the nucleus
- 26. a mixture is physical, because the _______ of the substance is not changed
- 27. discovered the neutron
- 28. atomic _______ tells the number of protons in an element
- 29. Thomson's model of the atom resembles cookie _____.
- 30. the category of elements that have characteristics of metals and nonmetals
- 33. _______ mass tells the average mass of all isotopes of an element