Across
- 4. smallest unit of matter
- 5. bond formed between a metal and a nonmetal
- 7. subatomic particle with a neutral charge
- 8. well-tested rules for the natural world
- 10. explanations for observations of the natural world
- 14. elements that conduct heat and electricity well
- 15. type of energy that results in heat
- 17. subatomic particle with a negative charge
- 20. two or more elements bonded together
Down
- 1. the outer electrons in an atom
- 2. bond formed between two nonmetal elements
- 3. energy of movement
- 6. organized chart of elements
- 9. an educated guess as an answer to an observation
- 11. any substance with mass and that takes up space
- 12. subatomic particle with a positive charge
- 13. elements that are not good conductors
- 16. rows of the periodic table
- 18. made of protons and neutrons, center of an atom
- 19. columns on the periodic table