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Finding the Missing Elements
Finding the Missing Elements
(from Hands-On Chemistry, 2.2.1)
pTable (heat maps of properties)
periodictable.com (graphs of properties)
Mendeleev's original periodic table arranged elements according to observed properties. You will go through the same process as you attempt to arrange color "chips" in a logical fashion.
After Mendeleev arranged the known elements in a table he noted that there were holes (vacancies) and he predicted that new elements would be found to fill these. Within 15 years of his prediction, all holes were filled with elements that had properties similar to those Mendeleev predicted.
ACTIVITY-1: Periodic or Non-Periodic Phenomenon? - Categorize each phenomenon as periodic (occurring or recurring at regular intervals) or non-periodic.
ACTIVITY-2: Construct a "period table" - Arrange the color chips in a logical manner according to color, shade, hue, and position in the ROYGBIV spectrum. Determine the location of "missing elements" (missing color, hue & shade).
ACTIVITY-3: Mendeleev Card Sort - Determine the identity of 9 unknown elements based on their properties
ACTIVITY-4: Periodictiy in the Elements - Determine which properties are periodic
Questions:
(1) Were you able to form a periodic table with rows (periods) and columns (groups)? Explain how you arranged your table.
(2) Were you able to predict the properties (color and shade) of the three elements not yet discovered. Where did you place these elements in your table?
(3) Explain the value of your periodic table in predicting properties of paint chips, and explain how chemists used the Periodic Table to predict the existence of unknown elements.
(4) Which "elements" are missing?
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