1. 7th Grade Unit 11: Chemical Reactions and Compounds Lesson 1: Physical Properties of Elements Vocabulary of Instruction:

2. 1. Brittle Having little elasticity; hence easily cracked, fractured, or snapped.

3. 2. Conductivity Property of metals and alloys that allows heat or electrical charges to pass through the material easily.

4. 3. Ductile Ability of metals to be drawn into wires.

5. 4. Luster Property of metals and alloys that describes having a shiny appearance or reflecting light.

6. 5. Magnetic The properties and interactions of magnets to attract other metal objects.

7. 6. Malleable Ability of metals and alloys to be rolled or hammered into thin sheets.

8. 7. Metal Element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat and electricity.

9. 8. Metalloid Element that shares some properties with metals and some with nonmetals.

10. 9. Nonmetal Element that usually is a gas or brittle solid at room temperature, is not malleable or ductile, is a poor conductor of heat and electricity, and typically is not shiny.

11. 10. Reactive A chemical that, in the pure state, or as produced or transported, will vigorously polymerize, decompose, condense, or become self-reactive under conditions of shock, high pressure, or high temperature.

12. 11. Semiconductor Materials having conductivity properties between that of metals (good conductors) and nonmetals (insulators) and having controllable conductivity parameters. Silicon Germanium

13. 12. Sonorous Capable of giving out a deep, resonant sound.