Across
- 3. the weighted-average mass of the mixture of its isotopes
- 5. the number of proton and neutrons
- 6. atom with different amount of neutrons
- 9. The center of an atom
- 10. 1- charge
- 14. the elements arranged by atomic number
- 15. 1+ charge
Down
- 1. the amount of protons
- 2. Everything is made of
- 4. uses the symbol of the element and dots to represent the electrons in the outer energy level
- 7. Where electrons are found randomly
- 8. Protons and neutrons are made of
- 11. The vertical columns in the periodic table
- 12. The horizontal columns in the periodic table
- 13. no charge