In this module, you will learn:

  • about elements
  • the periodic table
  • some examples and their characteristics.

Resources to help you:

  • Textbook: page 57, 58, 59 and 60
  • Notebook: page 28

Elements, Compounds and Mixtures

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We learnt that all matter are made of very small particles called atoms. These atoms are so small we cannot see them even with a microscope.

Everything around us are made of atoms but they are joined together to create all the different things we see, touch or even smell.

Matter can be broken down into elements, compounds and mixtures.

All matter is made of atoms consisting of the elements in the Periodic Table

Credit: @maxxyustas via EnvatoElements

24K Gold bullion bars contain gold atoms (99.9%)

Credit: @f9photos via EnvatoElements

Iron is another element that is a metal that can be rolled into wires (ductile).

Credit: @begemot_dn via EnvatoElements

Elements

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An element is a substance that contains only one type of atom. It is the simplest form of matter and cannot be broken down into simpler substance.


Elements can be divided into two groups:

  1. metals
  2. non-metals

Harvesting sulphur (non-metal) from a volcano

Source: https://www.youtube.com/watch?v=y37EzVzasG4

Watch the video

Learn about some properties of metals and non-metals

Source: https://www.youtube.com/watch?v=Cg1Q3oQGHYQ

You can change the speed to 0.75x to make it easier to listen.

The Periodic Table

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The periodic table is a list of all elements. The elements are arranged according to it's atomic number and is arranged in rows and columns known as periods and groups respectively.

row = period

column = group

The periodic table is first developed by Dmitri Mendeleev and presented to the Russian Chemical Society in on March 6, 1869.

The periodic table is useful for us to predict the physical and chemical properties of the elements.

Watch the video

A history of the periodic table

Source: https://www.youtube.com/watch?v=oylTOhzpJL4

You can change the speed to 0.75x to make it easier to listen.

Ready for the next module?

In the next module, we will look at compounds.

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