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Explaining Chemical Formulas

Explaining Chemical Formulas. Element + Element = Compound. When elements combine to form compounds their chemical properties are changed. . Groups and Outer Electrons. As you descend a group the elements have more and more rings.

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Explaining Chemical Formulas

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  1. Explaining Chemical Formulas

  2. Element + Element = Compound • When elements combine to form compounds their chemical properties are changed.

  3. Groups and Outer Electrons • As you descend a group the elements have more and more rings. • All elements in a group have the same number of electrons in the outer shell.

  4. Noble Gasses-Stable • All noble gasses have a complete outer shell of electrons making them unreactive. • Remember all elements want a full outer ring. • When something is unreactive we call it stable.

  5. Halogens-Very Reactive • All halogens have 7 electrons in their outer shell. • They are 1 electron short of a complete shell. So they are looking to take in an electron.

  6. Alkali Metals-Very Reactive • All alkali metals have 1 electron in their outer shell. • They are looking to get rid of that 1 electron so that they can have a complete outer shell.

  7. Alkali Earth Metals-Fairly Reactive • All alkali earth metals have 2 electrons in their outer shell. • They are looking to get rid of 2 electrons so that they can have a complete outer shell.

  8. Electron Shells are 3D • Remember that electron rings are 3D even though we often draw them 2D.

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