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Atoms, Elements, Compounds, Mixtures, GLS.pptx

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Atoms, Elements, Compounds, Mixtures, GLS.pptx

  1. 1. Solid, Liquid or Gas? You need to remember which of the first 20 elements are gasses, and which are liquids
  2. 2. Compounds and Mixtures • All substances are either elements, compounds or mixtures. • An element is made up of only one type of atom. Carbon and oxygen are both elements. • A compound is a substance made up of two or more elements joined together. For example, when carbon atoms join with 2 oxygen atoms, they form a compound called carbon dioxide. • Carbon atoms that are just mixed with oxygen atoms, but are not attached to them, form a mixture. A mixture can also contain compounds, if they are not joined to the other substances in the mixture. • For example, air is a mixture of elements such as nitrogen and oxygen, and compounds, such as water and carbon dioxide.
  3. 3. “Stable” atoms/elements? Atoms are more stable energetically when they have eight electrons in their valence shell, the outermost electron shell. Atoms ‘want’ a full outer shell of electrons, i.e. they are most stable with a full outer shell. This explains why the Group 8 elements, the noble gases, do not react to make compounds — they are already as stable as they can be

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