exa.util.isotopes module¶
Periodic Table of Elements and Isotopes¶
This module provides a database of the atomic elements and their isotopes. Visualization parameters are also provided. Data is provided and maintained by NIST. The full api is given in the code example below. Note that not all attributes that are present on isotopes are present on elements (and vice versa).
from exa.util import isotopes
isotopes.H # Hydrogen element
isotopes.H[2] # Hydrogen isotopes 2 (deuterium)
isotopes.H.cov_radius # Empirical covalent radius (a.u. - Bohr)
isotopes.H.van_radius # Empirical Van der Waals radius (a.u. - Bohr)
isotopes.H.af # Abundance fraction
isotopes.H.afu # Abundance fraction uncertainty
isotopes.H.mass # Atomic mass (g/mol)
isotopes.H.massu # Atomic mass uncertainty (g/mol)
isotopes.H.eneg # Electronegativity (Pauling scale)
isotopes.H[2].quad # Nuclear quadrupole moment (eb - electron-barn - e10^(-28)m^2)
isotopes.H[2].A # Atomic mass number (g/mol)
isotopes.H.Z # Proton number
isotopes.H[2].g # Nuclear g-factor (dimensionless magnetic moment)
isotopes.H[2].spin # Nuclear spin
isotopes.H.color # Traditional atomic color (HTML)
isotopes.H.name # Full element name
Warning
Isotopes are provided as part of the static data directory.
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class
exa.util.isotopes.Element(symbol, name, mass, znum, cov_radius, van_radius, color)[source]¶ Bases:
objectAn element from Mendeleev’s periodic table.
from exa.util import isotopes H = isotopes.H # Hydrogen element (isotope averaged) D = isotopes.H['2'] # Deuterium (2H, a specific isotope) isotopes.H.isotopes # List of available isotopes
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property
isotopes¶
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property
radius¶
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property
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class
exa.util.isotopes.Isotope(anum, znum, af, afu, cov_radius, van_radius, g, mass, massu, name, eneg, quad, spin, symbol, color)[source]¶ Bases:
objectA specific atomic isotope (the physical manifestation of an element).
from exa.util import isotopes isotopes.U['235'].mass # Mass of 235-U
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property
radius¶
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property