Alkali Metals

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Potassium 100gr (metal) in liquid paraffin

200,00 incl. VAT 330200
Potassium 100gr (metal) Atomic Number (Ζ): 19 Atomic weight (Ar): 39.0983 Cas Number: 7440-09-7https://pubchem.ncbi.nlm.nih.gov/compound/Potassium

Sodium 100gr (metal)

68,00 incl. VAT 330240
Sodium, 11Na
Phase at STPsolid
Melting point370.944 K ​(97.794 °C, ​208.029 °F)
Boiling point1156.090 K ​(882.940 °C, ​1621.292 °F)
Density (near r.t.)0.968 g/cm3
when liquid (at m.p.)0.927 g/cm3
Critical point2573 K, 35 MPa (extrapolated)
Heat of fusion2.60 kJ/mol
Heat of vaporization97.42 kJ/mol
Molar heat capacity28.230 J/(mol·K)