Periodic Table

2. the smallest particle that has the properties of an element
5. a negatively charged subatomic particle found in the energy level of an atom
7. number the number of protons in the nucleus of an atom
9. law the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
11. an element that has properties of both a metal and nonmetal
12. the elements that are usually poor conductors of heat and electricity
14. the center of an atom; made up of protons and neutrons
16. family group 17 or 7A
18. a vertical column of elements in the periodic table
19. the elements that are good conductors of heat and electricity

1. gas family group 18 or 8A
3. a horizontal row of elements in the periodic table
4. a neutral subatomic particle in the nucleus of an atom
6. family group 16 or 6A
8. a positively charged subatomic particle in the nucleus of an atom
10. earth metal family group 2 or 2A
13. a region in an atom where there is a high probability of finding electrons
15. level any of the possible energies an electron may have in an atom
17. family group 1 or 1A