7S Chapter 8 Vocabulary

3. The ability of an object to transfer heat
5. One of the elements in Groups 3-12 of the periodic table
8. A horizontal row of elements in the periodic table
13. An element that lacks most of the properties of a metal
14. The ease and speed with which an element combines, or reacts, with other elements and compounds
16. A one or two-letter representation of an element
21. An arrangement of the elements showing the repeating pattern of their properties
22. An element in Group 1 of the periodic table
24. A substance that can conduct electric current under some conditions
25. An element found in Group 17 of the periodic table

1. The way a mineral reflects light from its surface
2. The ability of an object to carry an electric current
4. An element in Group 2 of the periodic table
6. An element in Group 18 of the periodic table
7. Small, positively charged particles that are found in the nucleus of an atom
9. A term used to describe a material that can be hammered or rolled into flat sheets
10. A term used to describe a material that can be pulled in to a long wire
11. A small particle in the nucleus of an atom with no electrical charge
12. The average mass of all the isotopes of an element
15. A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity
17. The number of protons in the nucleus of an atom
18. An element that has some characteristics of both metals and nonmetals
19. A tiny, negatively charged particle that moves around the outside of the nucleus of an atom
20. Elements in the same vertical column of the periodic table; also called a family
23. The central core of an atom which contains protons and neutrons