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6.5: Metalloids: Part Metal, Part Non-Metal
pg. 228
Key Concepts:
1. Elements of the same column (group) of the periodic
table have similar properties.
2. Metalloids have properties in between those of metals
and non-metals.
3. Elements can be both beneficial and harmful.
Figure 1: The green boxes are elements that
are metalloids. They are along the staircase
line on the right side of the periodic table
Properties of Metalloids
- metalloid properties are in between metals and nonmetals.
- All metalloids are solid at room temperature.
- Metalloids are weak conductors of electricity and
thermal energy.
Boron (B), Silicon (Si), Germanium (Ge), and Arsenic
(As).
Semiconductors
Semiconductors are important to electronics. Silicon and
germanium are used to make semiconductors used in
electronic devices. Semiconductors control the flow of
electricity in conductors like copper.
A Toxic Element
Arsenic is very toxic and is used as a poison. Arsenic is
still used in industrial processes, such as; wood
preservatives and insecticides on fruit trees. Arsenic is
found in the environment, soil, air, water, and in food.
Check Your Learning:
Questions 1 – 7, pg. 229
Wrap Up:
- A metalloid is an element that has properties in between
those of metals and non-metals.
- Metalloids are used to make the semiconductors in
computer chips.