Across
- 5. i am a gas with 8 protons and 8 neutrons.
- 6. My atomic mass is 35.453.
- 8. My atomic number is 79.
- 9. member of halide family with 53 protons.
- 10. i am a metal with 28 electrons.
- 12. I am the head of the carbon family
- 13. I am a noble gas with 2 electrons.
- 16. nitrogen family member with 16 neutrons.
- 17. member of carbon family in fifth period.
- 19. I am a transition metal with 25 electrons.
Down
- 1. I am a transition metal with 30 electrons
- 2. 78% of the air and found in the 15th group.
- 3. i am the first element in the fourth period
- 4. i have only 1 electron
- 7. i am a gas with a mass number of 19.
- 11. i have 20 neutrons
- 14. i have 26 protons.
- 15. my atomic number is 47
- 18. i am a metal &liquid at room temperature.