Periodic Table & Element Crossword

5. the number of electrons that Ar has
7. have a negative charge
9. these show the number of shells an element will have
11. the name of this symbol
12. there are 118 of these found on the Periodic Table
18. a compound __________ shows the ration of each element in a given substance
19. a type of bond where electrons are given from element to another
21. protons have this type of charge
22. neutrons have this type of charge
23. is one of two elements that only has one shell (symbol only)
24. sometimes the electrons surrounding a nucleaus are said to be the electron ___________.
25. are formed by the addition or removal of electrons to an element

1. first element on the periodic chart
2. all ionic compounds have this along with brittle crystals and the ability to conduct electricity
3. how many shells are possible
4. the last element on row 2
6. one of two liquids at room temperature
8. atomic mass of 15.999
10. this element has 10 neutrons and is on the second row
13. last name of the man who created the periodic chart
14. protons and neutrons are found here
15. sometimes a group is called this
16. these electrons are found in the last shell
17. symbol is Si
20. the action that holds molecules together in a chemical reaction