Chemistry 2015

4. its chemical symbol is cl
5. holds the proton and the neutron
6. the bond formed between sodium and chlorine
7. the measurement of the reaction to changing the independent variable
9. the process of moving ions using electricity
11. the chemical compound when sodium and chlorine join
14. the largest group on the periodic table
17. this means correct, which is why scientists use the metric system
20. tells you how many protons and electrons an atom has
23. the - charged part of the atom and it travels in the electron orbit or shell
24. the green rock that results from copper oxide depositing in rocks over millions of years
25. its chemical symbol is na
26. the most reactive of the alakali metals

1. these on the periodic table tell you how many electron shells the atom has
2. a positively or negatively charged atom
3. the orbits upon which the electrons travel
6. what the scientist changes, and it goes along the bottom of the graph
8. the part of the atom that has no charge
10. the + charged part of an atom
12. what must stay the same in an experiment in order for it to be reliable
13. this is another reason why scientists use the metric system
15. these elements have 8 electrons in their outer shell which makes non reactive
16. there are this many periods on the periodic table
18. says that most atoms strive to have 8 electrons in their outer shell
19. the metric system is
21. the green substance that is the result of copper reacting with an acid, and was left on our pennies
22. the least reactive of the alkali metals