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• Clean Air Status and Trends Network (CASTNET)

  Offsite — 8-hour daily maximum ozone concentrations as measured by the Clean Air Status and Trends Network (CASTNET) Additional facts from data.gov Dataset Summary Date Released: 4/1/1987 Date Updated: 5/5/2009 Time Period: 8-hour maximum over a single day Data.gov Data Category Type: Raw Data Catalog Frequency: Daily, for each operating day of each station Specialized Data ...

• The Periodic Table of Elements

  Free Download — This is a stylized Excel spreadsheet of the periodic table of elements. It includes the element name, atomic number, symbol, phase, electronegativity (Pauling), first ionization potential (eV), atomic weight (g/mol), melting point (°C, 1 atm), boiling point (°C, 1 atm), density (g/cc or g/L), and the most common crystal structure. This data is one of a set of ...

• Properties of the Periodic Elements

  Free Download — This dataset lists all of the periodic elements and many of their associated properties in a comprehensive format, including the element name, atomic number, symbol, standard atomic weight, group, phase, type, ionic radius, atomic radius, electronegativity, first ionization potential, density, melting point, boiling point, number of isotopes, discoverer, year discovered, ...