Development of the Periodic Table

This lesson covers:

  1. The arrangement of the periodic table
  2. What a 'group' is on the periodic table
  3. What a 'period' is on the periodic table

The table displays all of the known elements. 


A row of elements is called a , while each column is called a .

periodic
period
group

0

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3

Periodic table highlighting elements in a period to show their similar chemical properties.

True or false? Elements within a period show similar chemical properties to each other.

True

False

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1

The atoms of elements in the same group have the same number of:

Electrons in their outer shell 

Electrons 

Protons

Shells 

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Periodic table highlighting elements in Group 2 showing similar chemical properties.

True or false? Elements within a group show similar chemical properties to each other.

True

False

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1

The alkali metals in group 1 of the periodic table all have how many electrons in their outer shell?

1

2

3

0

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1

Diagram showing chlorine in the periodic table with its atomic number and group.

Chlorine has an atomic number of . 


It's in group of the periodic table. This means it has electrons in its outer shell, and has similar chemical properties to the other elements in the same group

17
7
7

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3

Remember the final column in the periodic table is called group 0, not group 8.


The elemental atoms in this group have full outer shells of electrons, and so are stable and unreactive.

Are there more metal or non-metal elements?

Metal

Non-metal

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1

The atoms of elements in the same period have the same number of:

Protons

Electrons 

Shells 

Electrons in their outer shell 

0

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1