Across
- 6. horizontal row on periodic table
- 8. neutral particle in the nucleus
- 11. unit equal to 6.022×10²³ particles
- 12. scientist whose number is 6.022×10²³
- 13. number of protons in an atom
- 15. change in state, not identity
- 17. pure substance made of one type of atom
- 18. starting substance in a chemical reaction
- 19. energy required to remove an electron
- 21. positively charged particle
- 22. substance formed by a chemical reaction
- 23. basic unit of matter
- 24. dense center of the atom
- 25. weighted average mass of all isotopes of an element
Down
- 1. total protons and neutrons
- 2. force that holds atoms together
- 3. process where substances are transformed
- 4. atom with a charge
- 5. vertical column on periodic table
- 7. atoms with same protons but different neutrons
- 9. group of atoms bonded together
- 10. difference between actual and experimental value
- 11. creator of the periodic table
- 14. mass cannot be created or destroyed
- 16. substance of two or more bonded elements
- 17. symbolic representation of a chemical reaction
- 20. negatively charged particle