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These periodic tables use accurate data for name, atomic number, element symbol, atomic weight, and electron configuration, obtained from the International Union of Pure and Applied Chemistry or IUPAC. What we’ve done is list the tables, along with links, so you can get detailed info about each one.
For a fully interactive version with orbitals, isotopes, compounds, and free printouts, visit http://www.ptable.com/
ACS Periodic Table of Elements (PDF) Created Date: 11/26/2019 4:00:20 PM ...
Atomic Properties of the Elements FREQUENTLY USED FUNDAMENTAL PHYSICAL CONSTANTS§ 1 second = 9 192 631 770 periods of radiation corresponding to the transition between the two hyperfine levels of the ground state of 133Cs speed of light in vacuum 299 792 458 −m s 1 Planck constant 6.626 070 15 x 10−34 J Hz −1 elementary charge
h hydrogen 1 1.0079 li lithium 3 6.941 na sodium 11 22.990 k potassium 19 39.098 rb rubidium 37 85.468 cs cesium 55 132.91 fr francium 87 (223) be beryllium 4 9.0122 mg magnesium 12 24.305 ca calcium 20 40.078
* The atomic weights listed on this Table of Elements have been rounded to the nearest whole number. As a result, this chart actually displays the mass number of a specific isotope for each element. An element's complete, unrounded atomic
For notes and updates to this table, see www.iupac.org. This version is dated 1 December 2018. Copyright © 2018 IUPAC, the International Union of Pure and Applied Chemistry.