Across
- 4. period or energy level
- 5. chemical element that lacks characteristics of metal
- 6. same element with different number of neutrons
- 9. element whose properties are between metal and non-metal
Down
- 1. region on the periodic table
- 2. element with high thermal and electric conductivity
- 3. column on the periodic table
- 7. rings on which electrons lie
- 8. row on the periodic table