Across
- 3. you find them in the periodic table
- 8. has a mass of 1 but no charge
- 9. all living things do it
- 10. atom with 2,8,3 configuration
- 13. name of the particles that make the nucleus
- 15. substances made of positive and negative particles
- 16. elements with the same atomic number but with a different number of neutrons
- 18. used in pencils
- 20. Giant covalent structure
- 21. has a mass of 1 and a +1 charge
- 22. group 1 elements
- 23. involves the release of energy
Down
- 1. type of reactions that releases heat
- 2. gas to liquid
- 4. has a negligible mass and a -1 charge
- 5. only plants do it
- 6. substance that lowers the activation energy
- 7. does not conduct electricity
- 11. free roaming electrons
- 12. opposite of exothermic
- 14. term used to describe a shared pair of electrons
- 17. Conducts electricity when solid
- 19. elements in group 7