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Video: The History of the Periodic Table

Video: The History of the Periodic Table. Guided Questions. What are elements?. Elements are the simpler substances (atoms) from which all other substances are made. What was Aristotle’s 5 th element and where was it supposedly found?.

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Video: The History of the Periodic Table

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  1. Video: The History of the Periodic Table Guided Questions

  2. What are elements? • Elements are the simpler substances (atoms) from which all other substances are made.

  3. What was Aristotle’s 5th element and where was it supposedly found? • Aristotle’s 5th element was called “ether” and this was supposed to be the composition of heavenly bodies (the Gods).

  4. What was the goal of alchemy? • The goal of alchemy was to make gold! • Alchemists believed that any form of matter could be manufactured by varying the proportions of a few basic elements.

  5. What type of substances did alchemists mostly study? • Because alchemists wanted to make gold they mostly studied metals.

  6. Who is credited for insisting that the scientific method be used when experimenting with elements and thus started the science of chemistry? • Antoine Lavoisier is considered the father of modern chemistry as he performed numerous experiments in order to describe the chemical and physical properties of the elements.

  7. Antoine Lavoisier classified element into ____ categories and incorrectly included two forms of energy, ______________ and ______________ as elements • 4 categories: metals, nonmetals, gases & earths • Lavoisier thought that light and heat (energy) were elements

  8. In 1859 a tool called the spectroscope was invented. When elements where heated or electrified and viewed through the spectroscope, they showed spectral lines. Why are these spectral lines like fingerprints? • Every element has a different emission of spectral lines. Like fingerprints these line spectra served as a clear way to confirm the discovery of a new element

  9. Who is credited with creating the first periodic table? • DimitriMeneleev is given credit for coming up with first plan for classifying the elements. • M. made cards for each element that included the element symbol and atomic mass. He then laid them out in rows and columns to look for patterns (inspired by solitaire)

  10. What did this person do with the gaps left in his table? • Mendeleev left gaps in the table for elements that hadn’t been discovered yet. He knew the gaps should be there based on predicted properties of the elements in specific columns. • All of the gaps that M. left have now been filled

  11. The modern periodic table is not based on atomic mass, but rather _____________ _______________. • The modern periodic table is based on atomicnumber • This arrangement shows clearly repeating patterns in the physical and chemical properties of the elements

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