Chapter 5- Section 1 Arranging the Elements - PowerPoint PPT Presentation

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Chapter 5- Section 1 Arranging the Elements

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Chapter 5- Section 1 Arranging the Elements A Russian chemist named Dmitri Mendeleev was the first person to determine a pattern for the elements. – PowerPoint PPT presentation

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Title: Chapter 5- Section 1 Arranging the Elements


1
Chapter 5- Section 1Arranging the Elements
2
  • A Russian chemist
  • named Dmitri Mendeleev was the first person
    to determine a pattern for the elements.

3
Mendeleev
4
  • Mendeleev noted that there was a pattern
    within the properties of elements. He could then
    organize the elements depending on their atomic
    mass.

5
  • What is the atomic mass of
  • an element?

6
  • Atomic mass is the weighted average of the
    masses of all of the naturally occurring isotopes
    of an element. It is measured in atomic mass
    units.

7
  • To calculate the atomic mass
  • Multiply the mass of each isotope (PN) by its
    amount in decimal form.
  • Add the two numbers together atomic mass.
  • EXAMPLE
  • Chlorine
  • Cl-35 (76 of chlorine in nature)
  • Cl-37 (24 of chlorine in nature)
  • (35x0.76)26.6
  • (37x0.24) 8.9
  • 26.68.935.5amu

8
  • Properties of Elements

9
  • The properties of elements change in a
    periodic way, which means in a regular, repeating
    pattern. This is how the periodic table got its
    name.

10
  • Can you think of something in your life that has
    a periodic pattern?

11
  • Some physical properties of elements
    include color, density,atomic mass and luster

12
  • Some chemical properties of elements
    includeconductivity, flammability, and
    reactivity.

13
  • Periodic Law

14
  • The periodic law states that the chemical
  • and physical properties of elements are periodic
    functions of their atomic number.

15
  • In other words.. The of protons or
    electrons in an atom will help determine its
    characteristics.

16
  • Understanding the Periodic Table

17
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18
  • The periodic table may look confusing, but if
    you understand its pattern it will make more
    sense.

19
  • There are 3 main categories that elements are
    divided into metals, nonmetals and metalloids

20
  • What are some characteristics of each category?

21
  • Elements are placed into a specific groups
    based on their properties.

22
  • Location and Description of Elements

23
  • A zig zag line can be drawn on the periodic
    table to help remind you of the location of each
    type of element.

24
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25
  • Right of lineNonmetals
  • Left of line Metals
  • Border of line Metalloids

26
Metals
  • usually solid at room temp
  • Shiny
  • malleable (flattened)
  • ductile (made into wire)
  • good conductor of heat

27
Lithium
28
Sodium
29
Non Metals
  • usually gas at room temp.
  • non shiny
  • not malleable or ductile
  • poor conductor
  • brittle (can shatter)

30
Nitrogen
31
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32
Metalloids
  • share properties of both
  • metals and nonmetals

33
Silicon
34
Boron
35
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