The document discusses properties of metals and nonmetals. It notes that alkali metals are highly reactive and found only in compounds in nature because they react quickly with oxygen. It also states that more than 96% of the human body's mass comes from four nonmetals: oxygen, carbon, hydrogen, and nitrogen. Nonmetals and metalloids are located between metals and nonmetals on the periodic table, have no metallic properties, and are good insulators.

1. Patterns in Properties of Metals
Metallic properties include luster,
malleability, and electrical conductivity.

4. Why are the elements in group 1, the alkali metals,
found only in compounds in nature?
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

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

7. Nonmetals and Metalloids
• Where are nonmetals and metalloids
on the periodic table?
• What are the properties of nonmetals
and metalloids?

8. Have no metallic
properties
gaseous dull Good
insulators

9. Nonmetals
GROUP 14 - 16 HALOGENS NOBLE GASES

10. 1 2 18
13 14 15 16 17
3 4 5 6 7 8 9 10 11 12

11. Nonmetals
GROUP 14 - 16 HALOGENS NOBLE GASES

12. HALOGENS
1 2 18
13 14 15 16 17
3 4 5 6 7 8 9 10 11 12
• Found only as compounds in nature not as free elements
• React with metals and nonmetals

13. Nonmetals
GROUP 14 - 16 HALOGENS NOBLE GASES

14. NOBLE GASES
1 2 18
13 14 15 16 17
3 4 5 6 7 8 9 10 11 12
• Do not form compounds
• React with other elements in the lab

15. How are nonmetals different from
metals? (cont.)
What properties do nonmetals
have?

16. high
low

17. Between the metals and the nonmetals
on the periodic table.
1 2 18
13 14 15 16 17
3 4 5 6 7 8 9 10 11 12