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The periodic table is where all the different types of atoms are classified and compared to each other, put in groups and studied.
Here below is picture of the periodic table:

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The atom is the microscopic particle that makes up all matter, without atoms matter could not exist.
The atom consists of different smaller particles, namely the proton, Neuton and electron.
Here is a diagram:

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Group: 2
Period: 4

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Group: 1
Period: 4

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Group: 8
Period:

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Group: 7
Period: 3

# data[].attributes.body
Group: 6
Period: 3

# data[].attributes.body
Group: 5
Period:

# data[].attributes.body
Group: 4
Period: 3

# data[].attributes.body
Group: 3
Period: 3

# data[].attributes.body
Group: 2
Period: 3

# data[].attributes.body
Group: 1
Period: 3

# data[].attributes.body
Group: 8
Period: 2

# data[].attributes.body
Group: 7
Period: 2

# data[].attributes.body
Group: 6
Period: 2

# data[].attributes.body
Group: 5
Period: 2

# data[].attributes.body
Group: 4
Period: 2

# data[].attributes.body
Group: 3
Period: 2

# data[].attributes.body
Group: 2
Period: 2

# data[].attributes.body
Group: 1
Period: 2

# data[].attributes.body
Group: 8
Period: 1

# data[].attributes.body
Group: 1
Period: 1