chemistry crossword

6. a group of atoms bonded together.
8. a method of writing the chemical symbol of an element and surrounding it with dots to show the number of valence electrons.
9. The vertical columns on the periodic table.
11. the number of protons in the nucleus of an atom.
12. a particle about the same mass as a proton but with no charge.
13. The temperature when a liquid starts to vaporize.
15. it is a shorthand method of representing an element.
19. when a solid formed from a solution.
20. The temperature when a soled starts to liquidize.

1. a substance made by mixing other substances together.
2. Horizontal rows of elements.
3. a stable particle with a negative electricity it found in all atoms and acting as the main carrier of electricity in solids.
4. a stable particle occurring in all atoms it has positive charge.
5. The center of a atom.
7. the around a nucleus where electrons are found.
10. A table filled with elements in order of atomic numbers.
14. the amount of compactness in somthing.
16. able to dissolve other substances.
17. Good conductors of heat and electricity.
18. exploding