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Chapter 2 - Chapter 2 All matter is made from/of atoms...

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Chapter 2 All matter is made from/of atoms Atoms are the smallest form of matter Within an atom at least one proton and one electron Protons (+) Electrons(-) Neutrons Elements are purist form of matter 96%-98% of all living things are going to be composed of H, C, O, N, P, and S. Elements are arranged left to right, by characteristic, and atomic number. Atomic #-#of protons Atomic mass - # of protons + neutrons Isotope - atoms of the same element, but different atomic weights, same protons, but different # of neutrons. Ex). Hydrogen isotopes Uses for radioactive isotopes Carbon dating (fossils) Chemo./radiation Medical imaging If the outer shell is not full it will be reactive, the atom wants to have a full outer shell to be happy. The outer shell/outer orbit=Valance Shell First Shell can hold 2 electrons Second Shell can hold 8 electrons Bonds Elements can come together and form a molecule-two or more atoms bonded
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Chemical bond : is going to be the linkage that holds the atoms together.
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