Across
- 1. anything with mass and volume
- 4. process by which unstable atoms eject particles until they become stable
- 6. measurement of the average motion of the particles in a substance
- 8. an atom with a charge
- 9. the most abundant element in the universe
- 16. most elements in the human body are these
- 17. the hottest state of matter
- 18. most elements on the periodic table are these
- 20. several atoms bonded together
- 23. the study of atoms and their behavior
- 25. particle in atoms with no charge
- 26. chemical reaction where a fuel combines with oxygen to produce water and carbon dioxide
- 27. a species of atom with a certain number of protons
Down
- 2. the number of electrons the first energy level can hold
- 3. the basic building block of matter
- 5. a version of an element with a certain number of neutrons
- 7. chemical reaction in which energy is released
- 10. positive particle in atoms
- 11. the center of an atom
- 12. the amount of space something takes up
- 13. the study of life
- 14. bond where atoms share electrons
- 15. the most important element for life
- 19. when an atom splits into two smaller atoms
- 21. when two atoms combine to make a larger atom
- 22. bond where one atom gives electrons to another
- 24. negative particle in atoms