periodic table
Across
- 5. this family is non reactive and contains the element Kr
- 7. most reactive non-metal family and the 2nd most reactive family
- 8. most reactive family and contains the element Cs
- 9. do not add mass to the atom
- 13. the number of negatively charged atoms in the outermost shell or the orbital
- 16. composed of 2 or more compounds physically combined
- 17. a substance made of 2 or more elements chemically combined
- 18. will never change, because if you change the number of them the atom will change
- 19. combine 2 liquids and form a solid. it is always a chemical change
- 20. pure substance that cannot be broken down into something simpler by chemical means
Down
- 1. all the elements to the left of the staircase line
- 2. atoms will always react until they have a full shell
- 3. an electrically charged element formed from the movement of electrons
- 4. touching the staircase line
- 6. the elements are all arranged on this
- 10. created the modern periodic table
- 11. total number of protons and neutrons in an atom
- 12. tells the number of protons
- 14. everything to the right of the staircase line
- 15. add mass to the atom