Periodic Table

3. have a positive charge, found in the nucleus of the atom
4. (also known as group) elements react and have similar properties
6. atoms will always react until they have a full shell
8. all of the elements to the left of the staircase (except for Hydrogen), are typically hard
10. the number of protons in an atom
12. everything to the right of the staircase line, are brittle and gaseous
16. the most reactive family on the periodic table
18. have no charge (found in the nucleus)
19. a substance made of 2 or more elements chemically combined
20. a type of mixture where the particles can be seen because they look different

1. a type of mixture where the particles cannot be seen because they look the same
2. tell how many shells each element has
5. total of protons and neutrons in an atom
7. the number of electrons in the outermost shell
9. pure substances that cannot be broken down into something simpler by chemical means
11. the family that has properties of both metals and nonmetals, this family touches the "staircase line"
13. the only non-reactive family on the periodic table
14. negative charge (found in the shell)
15. composed of 2 or more compounds physically combined
17. the smallest unit of an element