Pt Periodic Table

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Element Platinum (Pt), Group 10, Atomic Number 78, d-block, Mass 195.084. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Jump to main content. The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called groups) and columns (called periods) according to increasing atomic number. Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. A horizontal row in the periodic table. The atomic number of each element increases by one, reading from left to right. 190 Pt 189.960 0.012. Pt Au Ds Rg Cu Zn Ag Cd Hg Tl Cn Nh Ga Ge In Sn B C Al Si Pb Bi Fl Mc Po At Lv Ts As Se. PERIODIC TABLE OF ELEMENTS. Title: Periodic Table Author.

Extensible periodic table of the elements

Project description

This package provides a periodic table of the elements withsupport for mass, density and xray/neutron scattering information.

Masses, densities and natural abundances come from theNIST Physics Laboratory, but do not represent a criticalevaluation by NIST scientists.

Neutron scattering calculations use values collected by theAtomic Institute of the Austrian Universities. These valuesdo corresponding to those from other packages, though thereare some differences depending to the tables used. Boundcoherent neutron scattering for gold in particular is significantlydifferent from older value: 7.63(6) as measured in 1974compared to 7.90(7) as measured in 1990.

X-ray scattering calculations use a combination of empirical andtheoretical values from the LBL Center for X-ray Optics. Thesevalues differ from those given in other sources such as theInternational Tables for Crystallography, Volume C, and so maygive different results from other packages.

Install using:

There are several web interfaces to this package:

Documentation is available online.

Source links:

Known issues

  • Incoherent scattering computed for contrast matched mixture in D2O_sld(),differs from the value that would be computed for a compound with the sameisotope proportions and density computed in neutron_sld(). This may changein a future release.
  • The mass and composition tables are out of date. This package uses tablesfrom 1997 but IUPAC produced new tables in 2009.
  • Incoherent scattering calculations for energy-dependent rare earth elementsis underestimated. The calculation requires bound incoherent scatteringlengths (b_i) and the bound coherent lengths (b_c), but only b_c isincluded.

Change history

1.6.0 2021-04-21


  • Add energy dependence for rare earths (Lynn and Seeger, 1990).


  • Use complex b_c when computing the coherent cross section, leading tocorrect values of sigma_c and sigma_i for materials with large absorption.With this change the tabulated values for B[10] are now shown to beself-consistent within a few percent.

Breaking changes:

  • Neutron scattering factors are returned with one value for each wavelengtheven for energy independent elements. Previous versions returned a scalarif the returned value was identical for each wavelength.

1.5.3 2020-11-04

Breaking changes:

  • Fix calculation of contrast match points for biomolecules. The oldformula used the density of H2O for the D2O sld calculation.
  • Modify biomolecule support to use H[1] rather than T for labile hydrogen.This will result in less error when the labile formula is used in lieuof the natural formula or the contrast-matched formula, and make it moreobvious from glancing at the formula that labile hydrogen is present.
  • Modify fasta.Molecule attributes, dropping Hmass and Hsld. Hnaturalhas been moved to natural_formula. The formula with labile hydrogen isstored in labile_formula, as well as formula as before.


  • Add replace() method to formula to allow isotope substitution.
  • Add nsf.D2O_match() and nsf.D2O_sld() functions.


  • Neutron wavelength now defaults to 1.798 A when wavelength and energy areboth None in neutron_sld() and neutron_scattering() rather thanthrowing an assertion error.
  • table can be passed to neutron sld calculators as the source of isotopeinformation when parsing the chemical formula.
  • Switch unit test framework from nose to pytest.
  • Update docs.

1.5.2 2019-11-19


  • Carbon density changed from 2.1 to 2.2 to match CXRO, CRC and RSC. The NISTX-ray attenuation tables use 2.26; the Handbook of Mineralogy has 2.09-2.23.The Neutron Data Booklet gave the value as 1.9-2.3, and 2.1 was chosenfrom this range. The remaining density will continue to use values from theNeutron Data Booklet, which cites CRC as the primary source.
  • Updated references.

1.5.1 2019-09-09


  • fasta uses natural abundance of H for biomolecule when computing theD2O contrast match rather than the biomolecule with pure H[1].
  • remove half-life units from column header in activation table sinceeach row gives its own units.

1.5.0 2017-05-11


  • mixture by mass and volume, e.g., 5 g NaCl // 50 mL [email protected]
  • multilayer materials, e.g., 5 um Si // 3 nm Cr // 8 nm Au
  • add support for bio molecules with labile hydrogens
  • update list of possible oxidation states to include rare states


  • fixed computation of incoherent cross section so it is consistent withcoherent cross section and total cross section

1.4.1 2014-02-04


  • default density is now the isotopic density rather than the natural density

1.3.10 2013-10-25


Interactive Periodic Table Of Elements - Fisher Sci

  • fix activation calculation to ignore fast neutrons in thermal environment
  • add emission spectra for remaining elements above neon

1.3.9 2013-04-23


  • Update requirements to pyparsing<2.0.0 (we don’t support python 3 yet)

1.3.8 2013-04-08


  • formula parser supports density spec and mix by weight/mix by volume


  • py2exe/py2app wrapping now includes missing activation.dat
  • skipping bad 1.3.7 build which didn’t include all changes

1.3.6 2013-03-05


  • add activation decay time to neutron activation calculator


  • Change neutron scattering calculations for incoherent cross sectionto be the linear combination of the incoherent cross sections of theindividual atoms rather than total cross section minus the coherentcross section. Penetration depth of the unscattered beam still usesthe total cross section plus the absorption cross section.

1.3.5 2013-02-26


  • formulas now report charge and mass_fraction
  • formula parser accepts ions as Yy{#+} or Yy[#]{#+} for isotopes
  • support neutron activation calculations
  • support xray refraction index and mirror reflectivity


  • update X-ray scattering tables for Zr
  • adjust ion mass for number of electrons
  • ions now display as Yy{#+} rather than Yy^{#+}
  • fix formula.natural_density
  • fix formula.hill so C,H come first
  • fix element.interatomic_distance
  • formula(value=…) -> formula(compound=…)

1.3 2010-12-05


  • mix_by_weight and mix_by_volume formula constructors
  • use natural density to set density for isotope specific formulas
  • add neutron_scattering function which returns xs, sld and penetration depth


  • need wavelength= or energy= for xray/neutron sld
  • improved docs and testing
Pt symbol periodic table

1.2 2010-04-28


  • support pickle: id(H) id(loads(dumps(H)))
  • support ions, with magnetic form factors and x-ray f0 scattering factor
  • support py2exe wrappers
  • allow density to be calculated from structure (bcc, fcc, hcp, cubic, diamond)
  • estimate molecular volume
  • support private tables with some values replaced by application


  • rename package periodictable
  • rename table to periodictable.elements
  • neutron sld returns real and imaginary coherent and incoherentinstead of coherent, absorption and incoherent
  • bug fix: sld for H[2] was wrong when queried before sld for H.
  • remove CrysFML ionic radius definitions

1.1 2009-01-20


  • Restructure package, separating tests into different directory

  • When defining table extensions, you should now do:

    rather than:

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