Miscellaneous`ChemicalElements`Basic properties of the chemical elements. This loads the package. This gives the atomic weight of tungsten using the data in the package.
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If you ask for the atomic weight of an unstable element, Mathematica issues a warning message.
AtomicWeight::"unstable": "No stable isotope of \!\(Plutonium\) exists."
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This switches off the warning message. Here is a plot of the ratio of atomic weight to atomic number.
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Physical properties of chemical elements. The densities given are usually for the elements at  Kelvin and one atmosphere pressure. A message is generated if the density given is for another temperature or for a special form of the element. The thermal conductivities are for the specified elements at  Kelvin unless a message is returned giving an exception. This gives the heat of fusion of nitrogen.
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When you ask for the density, Mathematica warns you that this density is taken at a temperature of 21 Kelvin. The standard used for most other elements is 298 Kelvin.
Density::"temp": "Density is for \!\(Nitrogen\) at \!\(21\) Kelvin."
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This thermal conductivity is for the gaseous state.
ThermalConductivity::"form": "Thermal conductivity is for the \!\(\"gaseous\"\) form of \!\(Nitrogen\)."
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Electronic structure of chemical elements. When you use ElectronConfiguration to get the electronic configuration of an element, the result is a list using the standard order of listing of subshells  ,  ,  ,  . Each shell is grouped into a sublist. ElectronConfigurationFormat returns the number of electrons in each subshell along with the label for the subshell. This gives the electronic configuration as a list in the standard format.
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This includes the orbital labels in the list.
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Ionization potential and specific heat of chemical elements. This gives the specific heat of potassium.
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This gives the ionization potential of helium.
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Here is a plot of the ionization potential against the atomic number of the elements.
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Abundances of the chemical elements. This gives the ten most abundant elements in the Solar System.
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