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The Chemistry of Life

Explore the basics of chemistry by defining atoms, elements, isotopes, and compounds. Learn about atomic structure, mass numbers, and practical applications of isotopes. Dive into the world of compounds and their composition.

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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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