CHEM 0010 Unit


UNIT # 4
Introduction
Objectives
Reading
4.1 The Periods 4.2 The Groups 4.3 Metals, Nonmetals, Semimetals 4.4 Metallic Bonding 4.5 Octet Rule 4.6 Ions 4.7 Covalent Bonding 4.8 Atomic Size 4.9 Ionic Size 4.10 mp/bp Trends 4.11 Metallic Trend More periodic Trends
Problems 1 \| 2 \| 3
Crossword How well do you know your Periodic Table?

THE PERIODIC TABLE

4.3 - Metals, Nonmetals and Semimetals

4.3.3 - The Properties of the Semimetals

Click to view the semimetals

semimetals are sometimes called metalloids

semimetals have both metallic and nonmetallic properties

semimetals are semiconductors, in other words, they are not as conducting as metals and are not insulators like the nonmetals (i.e. silicon and gallium arsenide (GaAs) are used widely in the semiconductor industry)

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