Unit 1 lesson 17ppt

Metallic properties include luster, malleability, and electrical conductivity.

Patterns in Properties of Metals

Alkali metals are highly reactive metals. They react

quickly with other elements, such as oxygen. So, in

nature, they are found only in compounds.

ex: NaCl

Why are the elements in group 1, the alkali metals,

found only in compounds in nature?

More than 96 percent of the mass of the human body comes from four nonmetals–oxygen, carbon, hydrogen, and nitrogen.

The Elements of Life

• Where are nonmetals and metalloids on the periodic table?

• What are the properties of nonmetals and metalloids?

Nonmetals and Metalloids

Have no metallic

properties

gaseous dull Good

insulators

Nonmetals

GROUP 14 - 16 HALOGENS NOBLE GASES

1 2

3 4 5 6 7 8 9 10 11 12

13 14 15 1617

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Nonmetals

GROUP 14 - 16 HALOGENS NOBLE GASES

HALOGENS

• Found only as compounds in nature not as free elements• React with metals and nonmetals

1 2

3 4 5 6 7 8 9 10 11 12

13 14 15 16 17

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Nonmetals

GROUP 14 - 16 HALOGENS NOBLE GASES

NOBLE GASES

• Do not form compounds• React with other elements in the lab

1 2

3 4 5 6 7 8 9 10 11 12

13 14 15 16 17

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How are nonmetals different from metals? (cont.)

What properties do nonmetals have?

high

low

Between the metals and the nonmetals on the periodic table.

1 2

3 4 5 6 7 8 9 10 11 12

13 14 15 16 17

18