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The Chemistry of Life

Content Objectives: Define atoms, elements, isotopes & compounds. Describe the structure of an atom. Determine an element’s atomic number and mass number. The Chemistry of Life. Homework – 9/12/2016. Read section 2.1 and take notes in your biology notebook Define vocabulary words

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The Chemistry of Life

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  1. Content Objectives: Define atoms, elements, isotopes & compounds. Describe the structure of an atom. Determine an element’s atomic number and mass number. The Chemistry of Life

  2. Homework – 9/12/2016 • Read section 2.1 and take notes in your biology notebook • Define vocabulary words • Take note of main ideas • Sketch models • Write down questions you want to ask during discussion times.

  3. Atoms • An atom is the smallest unit of matter. • Proton = positive (+) • Neutron = no charge • Nucleus – center of the atom • Electron = negative (-)

  4. What is matter?

  5. Elements • An element is a substance made of one type of atom. • 92 naturally occurring elements

  6. Elements

  7. Elements • Atomic number = number of protons / electrons • Symbol • Mass number = number of protons + neutrons

  8. Elements

  9. Isotopes • Isotopes are atoms of the same element that have different numbers of neutrons.

  10. Radioactive Isotopes • Some isotopes are radioactive, so their nuclei are unstable and breakdown at a constant rate over time. • Can be dangerous • Have practical applications • Geologist date ages of rocks and fossils • (carbon dating) • Radiation can be used to treat cancer and kill bacteria

  11. Compounds • A compound is a substance made from two or more elements in definite proportions. H2O NaCl

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