Across
- 5. - have 1-2 valence electrons
- 6. - where protons and neutrons are located
- 10. the same composition throughout
- 12. - most abundant metal in the Earth's crust
- 13. - Mat be separated physically into pure substances
- 14. - # defies the element and the same number of protons
- 15. - made the atomic theory of matter
- 16. - Group 1 metals
- 18. - weakest force in nature
- 19. - Everything that has mass and occupies space
Down
- 1. - this element has 1 proton
- 2. vertical columns in the periodic table
- 3. - element will melt in your hand
- 4. - negatively charged subatomic particle in an atom
- 7. - This is the greatest of the four forces
- 8. - The number in front of the letters in a chemical equation
- 9. - most stable group
- 11. - Horizontal rows in the periodic table
- 14. - always found combined
- 17. - drawn into a wire