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Learn about elements, compounds and mixtures in this KS3 Chemistry guide from BBC Bitesize.
The periodic table. Copper has been used by humans for as much as 7000 years and elements such as gold, silver, tin, lead and mercury have been known for many thousands of years. However, the...
Photo credit: nasa.gov. The first true periodic table of elements was discovered by Dmitrii Mendeleev, a Russian scientist in 1869. Mendeleev saw the periodic nature of similar repeating traits of different elements. He organized the elements in a periodic table.
An element is a pure substance that is made from a single type of atom. Elements are the building blocks for all the rest of the matter in the world. Examples of elements include iron, oxygen, hydrogen, gold, and helium. An important number in an element is the atomic number.
The term 'element' is used to describe atoms with specific characteristics. There are almost 120 known elements. For example, you are made up of billions of billions of atoms but you probably won't find more than 40 elements (types of atoms) in your body.
Explore the concept of chemical elements and the definition of an element in science with this guide for KS3 chemistry students aged 11-14 from BBC Bitesize.
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The periodic table of the elements used in chemistry was devised by the Russian scientist Dmitri Mendeleev (also spelled Dmitry Mendeleyev). His final version of the table in 1871 left gaps, suggesting that other elements would later be discovered.
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