What are the advantages of the PRO version?

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Additional properties of Chemical Elements in PRO version: + Molar heat of vaporization + Molar heat of fusion + Specific heat capacity + Thermal expansion + Liquid density + Volumetric modulus of elasticity + Young's modulus of elasticity + Heat transfer coefficient + Speed of sound + Refractive index + Poisson's ratio + Shear modulus + Brinell hardness + Mohs hardness + Vickers hardness + Half-life + Radioactivity + Period of existence of an element + Name of spatial symmetry group + Number of spatial symmetry group + CID number + RTEC number + Nuclear effective cross section + Standard electrode potentials + Molar volume + Country of discovery