The Periodic Table of Elements

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Presentation transcript:

The Periodic Table of Elements 1

Elements Science has come along way since Aristotle’s theory of Air, Water, Fire, and Earth. Scientists have identified 92 Natural elements, and created about 28 others. 2

Elements The elements, alone or in combinations, make up our bodies, our world, our sun, and in fact, the entire universe. 3

Periodic Table A great deal of information about an element can be gathered from its position on the period table. Understanding the organization and plan of the periodic table will help you obtain basic information about each of the 118 known elements. 4

Periodic Table 5

Metals 6

Properties of Metals Metals appear to the left of the dark ziz-zag line on the periodic table. Most metals are solid at room temperature. 7

Properties of Metals Metals have luster. This means they are shiny 8

Properties of Metals Ductile metals can be drawn into wire. 9

Properties of Metals Malleable metals can be hammered into sheets 10

Properties of Metals Metals have a high melting point. They are also very dense. 11

Properties of Metals Conductors Metals are good conductors of electricity and heat 12

Properties of Metals A chemical property of metal is its reaction with water and oxygen. This results in corrosion and rust. 13

Nonmetals 14

Properties of Nonmetals Nonmetals occur to the right of the dark zig-zag on the periodic table. Although Hydrogen is in family 1, it is also a nonmetal. Many nonmetals are gases at room temperature. 15

Properties of Nonmetals Nonmetals do not have luster; they are dull. 16

Properties of Nonmetals Brittle Nonmetals are brittle so they break easily. This means nonmetals ARE NOT ductile or malleable. 17

Properties of Nonmetals Nonmetals have low density. 18

Properties of Nonmetals They also have a low melting point. This is why they are poor conductors of heat and electricity. 19

Metalloids 20

Properties of Metalloids Metalloids can be found clustered around the dark zig-zag line that separates metals and nonmetals. 21

Properties of Metalloids Metalloids (metal- like) have properties of both metals and nonmetals. 22

Properties of Metalloids Metalloids are solids that can be shiny or dull. 23

Properties of Metalloids They conduct electricity and heat better than nonmetals but not as well as metals. 24

Properties of Metalloids Metalloids are malleable and ductile 25

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Families Families in the periodic table share chemical properties because all elements in a family have the same number of valence electrons This means that all elements in a family bond with other atoms in a similar way.

Properties of Metals Most metals have 3 or less valence electrons and therefore are likely to lose these electrons in chemical bonds. 29

Properties of Nonmetals Nonmetals have 5 or more valence electrons and therefore usually gain electrons in chemical bonds. 30