The periodic table of the elements in its modern form was first prepared in the late 1800’s. This arrangement was slightly changed a few decades later. This allowed the development of the Periodic Law which states that when the elements are arranged by increasing atomic numbers, the properties tend to repeat. Many of the chemical and physical properties of the elements change in a regular fashion, with successive elements in either the same row or the same column of this table. Name three quantifiable properties, other than atomic weight or atomic number, that change in the manner described. How do each of these properties change across rows and down columns in the table? Explain, in terms of atomic structure, why each of these changes occurs in the manner observed.

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Go Green

The Fremont School District uses oil to heat school buildings. Go Green! is a new project the district will implement. The superintendent has declared that the district will dedicate itself to reducing its carbon footprint. In addition to taking serious energy-conservation measures, the district is planning to help offset its carbon dioxide emissions by raising money to help conserve a portion of a large tract of forest land adjacent to the high school campus. Describe one alternative energy source that would reduce the carbon footprint of the school district. Discuss one environmental benefit (other than reduced CO2 emissions) and one environmental drawback of using the alternative source instead of fuel oil.

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