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Chemistry in Context

Chemistry in Context. POGIL. ATOMS. p rotons, neutrons & electrons. ATOMS?. Think about Atoms. Dalton’s Atomic Theory. All matter is composed of extremely small particles called atoms. All atoms of a given element are alike.

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Chemistry in Context

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  1. Chemistry in Context

  2. POGIL

  3. ATOMS protons, neutrons & electrons

  4. ATOMS?

  5. Think about Atoms

  6. Dalton’s Atomic Theory • All matter is composed of extremely small particles called atoms. • All atoms of a given element are alike. • Compounds are formed when atoms of different elements combine in fixed proportions. • A chemical reaction involves a rearrangement of atoms. No atoms are created or destroyed or broken apart in a chemical reaction. Why do elements to have different chemical and physical properties?

  7. How did we get so far?

  8. Thompson discovered electron

  9. Milikan determined the charge on electron

  10. Rutherford’s Platinum Foil Experiment

  11. Neutrons

  12. Atom Subatomic particles So where are we?

  13. Isotopes

  14. The Periodic Table Group Period

  15. Atomic Structure • Atoms are composed of electrons, protons and neutrons whose relative masses and charges are shown in Table B.1. • The atomic number is the number of protons in the nucleus and gives the atom its identity. C has 6 protons, for example. • For a neutral atom the number of electrons must equal the number of protons. Ions have unequal numbers of protons and electrons and may have either positive (cation) or negative (anion) net charges. • Neutrons add mass but no charge – the mass number is the sum of the number of protons and neutrons. Isotopes of an element have the same number of protons but different numbers of neutrons. • The elements are given symbols, AZZ, where Z is the chemical symbol for the element, Z is the atomic number and A is the mass number.

  16. Chemical changes vs Nuclear changes • Chemical – atoms rearrange, but do not change atomic identity. • Nuclear – nuclear change, change in atomic identity possible across nuclear change.

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