Across
- 3. a bond formed when atoms share one or more pairs of electrons
- 5. negatively charged subatimic particle
- 6. good conductors of heat and electricity
- 11. a chemical reaction in which energy is released to the surroundings as heat
- 14. a substance or molecule that participates in a chemical reaction
- 15. an atom with same number of protons but different number of neutrons
- 16. family group 8A
- 18. the arrangement of atoms in a substance
- 22. family group 7A
- 23. a chemical formula that shows the number and kinds of atoms in a molecule, but not the arrangement of atoms
- 24. a substance that forms in a chemical reaction
- 25. equal to the number of protons
- 26. the attractive force that holds atoms or ions together
Down
- 1. brittle when struck
- 2. electrons in the outer most energy level
- 4. family group 2A
- 7. greek prefix for 10
- 8. positively charged subatomic particle
- 9. an atom who has gained or lost an electron
- 10. greek prefix for 2
- 12. greek prefix for 1
- 13. a chemical reaction that requires energy input
- 17. an atom's center
- 19. has characteristics of both metals and non metals
- 20. family group 1A
- 21. the attractive force between oppositely charged ions