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Atoms & Molecules - Electron arrangement determines the chemical properties of an atom

  • example

  • helium (He) is highly unreactive (inert)

    • one shell, two electrons

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Figure 2.10 Electron configurations of the first 18 elements (Biology, 6th Ed., Campbell & Reece)

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Web/CD Activity 2D: Build an Atom

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Atoms & Molecules - Chemical bonds

strong chemical bonds ionic bonds covalent bonds nonpolar covalent bonds polar covalent bonds weak chemical bonds hydrogen bonds

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Atoms & Molecules - Chemical bonds

strong chemical bonds

  • ionic bonds

  • covalent bonds

  • nonpolar covalent bonds

  • results in atoms being held together by chemical bonds

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Atoms & Molecules - Electron arrangement determines the chemical properties of an atom

  • How does a chemical reaction enable an atom to fill its outer electron shell?

  • 2 atoms w/incomplete outer shells react

    • each atom gives up or acquires electrons

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