# 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)
• 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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