Periodic Table Vocabulary

5. group 14
6. the elements that are good conductors of heat and electricity.
7. another name for group.
9. a positively charged subatomic particle in the nucleus of an atom.
13. a negatively charged subatomic particle found in the energy level of an atom.
14. the smallest particle that has the properties of an element.
15. a vertical column of elements in the periodic table.
16. group 17 or 17A.
20. the number of protons in the nucleus of an atom.

1. another name for metalloid.
2. the center of an atom; made up of heat and electricity.
3. the elements that are usually poor conductors of heat and electricity.
4. an electron in the outermost energy level of an atom.
8. the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number.
10. a neutral subatomic particle in the nucleus of an atom.
11. a horizontal row of elements in the periodic table.
12. symbol for atomic mass unit.
14. group 1 or 1A.
17. the total number of protons and neutrons in the nucleus of an atom.
18. any atoms having the same numbers of protons but different number neutrons.
19. an element that has properties of both metal and non-metal.