The Structure of the Atom and Periodic Table

5. The sum of protons and nuetrons (2 words)
6. Symbol for sodium
8. This group of elements are called rare earth, very reactive, hard to separate
11. symbol for silver
12. this is the same as the number of protons in an atom
13. This element is often made into electrical wire
15. These electrons are found farthest from the nucleus
18. This is the atomic number for fluorine
19. Name of an element used in fluorescent signs
21. This group of elements are the most reactive metals (2 words)
24. This is 1/12 the mass of a carbon-atom is the standard for measuring the mass of an atom (3words)
27. Group of elements that conduct heat well
29. A column of elements
31. A group of dense, radioactive metals
33. Positively charged subatomic particle
34. This radioactive gas can accumulate in houses

1. This group of elements are non-reactive due to their full outer shell (2 words)
2. 3 of these make up either a proton or a neutron
3. this group can conduct some heat and includes silicon and boron
4. This groups of elements are called the salt-formers
7. This element is an alkaline earth metal
8. Element 82
9. Group of elements that are used in wiring and jewelry
10. the negative charged subatomic particle
14. We need this important gas for living
16. The man who organized the periodic table to atmomic mass and repeating properties
17. Element used in balloons
19. the subatomic particle with approximately the same mass as the proton
20. The region surrounding the nucleus which is occupied by electrons (2 words)
22. Building block of matter
23. The same elements but have different mass numbers
25. This element is found in organic compounds
26. Center of the aton
28. A row of elements on the periodic table
30. The man who reorganized the periodic table by atomic mass
32. The scientist who found electrons to reside in orbits around the nucleus