alkali metals, power relationship

the alkali metals have a close fitting power relationship between atomic number (a)
and melting point (m, in degrees C)




this can be determined using a spreadsheet and fitting an appropriate (power) function



lithium, a = 3,  m = 181
sodium,  a = 11,  m = 98
potassium,  a = 19,  m = 64
rubidium,  a = 37,  m = 39
caesium,  a = 55,  m = 29
francium,  a = 87,  m = 27