Texas Instruments TI-83 Plus Manual Book page 10

Property Value Sources
The property values of the elements contained in this application
are based on one of two sources: The CRC Handbook of
Chemistry and Physics, 79th ed. (weight, boiling point, melting
point, discovery date), and Lange's Handbook of Chemistry, 15th
ed. (radius, 1st ionization potential, electronegativity, density,
configuration). See the section entitled "Works Cited" for detailed
bibliographic information.
Every effort has been made to ensure accuracy. However, if you
do find an error or have a comment for a product improvement,
please send an e-mail to ti-cares@ti.com.
Periodic Table for the TI-83 Plus Page 10