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  • Electrons
    • The number of electrons in an atom is the same as the number of protons in the nucleus.
      • The electrons are arranged in shells around the nucleus.
      • the first shell holds 2 electrons, and the rest can hold 8.
    • elements in the same group of the periodic table have the same number of electron in their outer shell
      • the number of shells tells us what period an element is in. the number of electrons on the outer shell tells us what group it is in.
    • elements with the same number of electrons in their outer shell react in a similar way.
    • electrons always fill the lowest energy shell available.


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