#source- http://mendeleev.readthedocs.io/en/stable/data.html

abundance_crust (float) : Abundance in the earth's crust in mg/kg

abundance_sea (float) : Abundance in the seas in mg/L

annotation (str) : Annotations regarding the data

atomic_number (int) : Atomic number

atomic_radius (float) : Atomic radius in pm

atomic_radius_rahm (float) : Atomic radius by Rahm et al. in pm

atomic_volume (float) : Atomic volume in cm3/mol

atomic_weight (float) : Relative atomic weight as the ratio of the average mass of atoms of the element to 1/12 of the mass of an atom of 12C

block (str) : Block in periodic table, s, p, d, f

boiling_point (float) : Boiling temperature in K

c6 (float) : C_6 dispersion coefficient in a.u. 

c6_gb (float) : C_6 dispersion coefficient in a.u. 

cas (str) : Chemical Abstracts Service identifier

covalent_radius_bragg (float) : Covalent radius in pm from

covalent_radius_cordero (float) : Covalent radius in pm

covalent_radius_pyykko (float) : Single bond covalent radius in pm

covalent_radius_pyykko_double (float) : Double bond covalent radius in pm

covalent_radius_pyykko_triple (float) : Triple bond covalent radius in pm

cpk_color (str) : CPK color of the atom in HEX

density (float) : Density at 295K in g/cm3

description (str) : Short description of the element

dipole_polarizability (float) : Dipole polarizability in atomic units

dipole_polarizability_unc (float) : Uncertainty of the dipole polarizability

discoverers (str) : The discoverers of the element

discovery_location (str) : The location where the element was discovered

discovery_year (int) : The year the element was discovered

electron_affinity (float) : Electron affinity in eV

electrophilicity (float) : Parr's electrophilicity index

econf (str) : Ground state electron configuration

evaporation_heat (float) : Evaporation heat in kJ/mol

fusion_heat (float) : Fusion heat in kJ/mol

gas_basicity (float) : Gas basicity

geochemical_class (str) : Geochemical classification of the elements

glawe_number (int) : Glawe number (scale)

goldschmidt_class (str) : Goldschmidt classification of the elements

group_id (int) : Group number

heat_of_formation (float) : Heat of formation in kJ/mol

is_monoisotopic (bool) : A flag marking if the element is monoisotopic

jmol_color (str) : Color of the atom as used in Jmol, in HEX

lattice_constant (float) : Lattice constant in ang

lattice_structure (str) : Lattice structure code

mass (float) : Relative atomic mass. Ratio of the average mass of atoms of the element to 1/12 of the mass of an atom of 12C

mendeleev_number (int) : Mendeleev number melting_point (float): Melting temperature in K

metallic_radius (float) : Single-bond metallic radius or metallic radius, have been calculated by Pauling using interatomic distances and an equation relating such distances with bond number

metallic_radius_c12 (float): Metallic radius obtained by Pauling with an assumed number of nearest neighbors equal to 12

molcas_gv_color (str) : Color of an atom

name (str) : Name in English

name_origin (str) : Origin of the name

period (int) : Period in periodic table

pettifor_number (int) : Pettifor scale

proton_affinity (Float) : Proton affinity

series (int) : Index to chemical series

sources (str) : Sources of the element

specific_heat (float) : Specific heat in J/g mol @ 20 C

symbol (str) : Chemical symbol

thermal_conductivity (float) : Thermal conductivity in @/m K @25 C

uses (str) : Uses of the element

vdw_radius (float) : Van der Waals radius in pm 

vdw_radius_bondi (float) : Van der Waals radius according to Bondi in pm

vdw_radius_truhlar (float) : Van der Waals radius according to Truhlar in pm

vdw_radius_rt (float) : Van der Waals radius according to Rowland and Taylor in pm

vdw_radius_batsanov (float) : Van der Waals radius according to Batsanov in pm

vdw_radius_dreiding (float) : Van der Waals radius from the DREIDING force field in pm

vdw_radius_uff (float) : Van der Waals radius from the UFF in pm

vdw_radius_mm3 (float) : Van der Waals radius from MM3 in pm

oxistates (list) : Oxidation states

ionenergies (dict) : Ionization energies

