Across
- 5. I have 20 protons.
- 6. used in advertising sign boards
- 8. am not really an metal, but since I have only 1 electron I behave like them.
- 9. I make up 78% of the air and am found in the 5th group.
- 11. the reactivity of metals _____________ as we go down the group
- 13. I am the first element in the fourth period used in making fertilizer.
- 14. I am the only element in the halide family that is a liquid.
- 15. metals _______ electrons to become stable
Down
- 1. metals The name given for group 1
- 2. I am a noble gas with 2 electrons.
- 3. the most reactive halogen
- 4. I am a gas with 8 protons and 8 neutrons.
- 7. Reactivity ___________ as we go down the group 7
- 10. noble gases have _______ electrons in their outer shell except for helium
- 12. I am the head of the carbon family known as the “basis of life”.with atomic number of 6