# A Guided Tour of the Periodic Table

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```					The Periodic Table
Chapter 5.1
Periodic Table
• Created by Dmitri Mendeleev; arranged in
increasing mass number.
• Modern Periodic table is arranged according
to increasing atomic number.
Parts of the Periodic Table
• Groups
– Vertical columns
– 1-18
– Elements have similar properties
• Periods
– Horizontal rows
– 1-7
Identify the element given its group number
and period number.
1)   Group 2; period 3
2)   Group 14; period 5
3)   Group 6; period 4
4)   Group 16; period 2
5)   Group 11; period 5
6)   Group 1; period 6
7)   Group 18; period 1
Identify the element given its group number
and period number.
1)   Group 2; period 3    magnesium
2)   Group 14; period 5   tin
3)   Group 6; period 4    chromium
4)   Group 16; period 2   oxygen
5)   Group 11; period 5   silver
6)   Group 1; period 6    cesium
7)   Group 18; period 1   helium
Group Number & Valence Electrons
• The group number indicates the number of
valence electrons.
Group Number    Number of Valence
Electrons
1                 1
2                 2
13                3
14                4
15                5
16                6
17                7
18       8 (except Helium has
only 2)
Period Number & Energy Levels
• The period number indicates the number of
energy levels present in the atom.
Period Number   Number of Energy
Levels
1                1
2                2
3                3
4                4
5                5
6                6
7                7
Practice Problem:
Element           Number of Valence   Number of Energy
Electrons           Levels
Ar

Sr

Si

Na

F

Po

Ga
Practice Problem:
Element       Number of Valence Number of
Electrons         Energy Levels
Ar               8                 3
Sr              2                 5
c               4                 2
H               1                 1
F               7                 2
Po               6                 6
Ga               3                 4

```
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