Across
- 5. number of protons in nucleus
- 6. the rows of the periodic table
- 7. small,neutrallly charged particle in nucleus
- 8. small,positively charged particle in nucleus
- 10. basic particle that make up all elements
Down
- 1. average mass of elements, protons & neutrons
- 2. electrons involved in chemical bonding
- 3. tiny particle outside nucleus, negative charge
- 4. the columns of the periodic table
- 9. ease and speed an elements reacts with other elements