Plot Temperature vs. Size
Here are the atomic masses and melting points of the elements as an array of values with associated units.
In[1]:=

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Plot the data and label the axes with the units.
In[2]:=
ListPlot[data, PlotTheme -> "Detailed", FrameLabel -> Automatic, 
 ImageSize -> 450]Out[2]=

Plot the data with attograms and kelvins as the desired units instead.
In[3]:=
ListPlot[data, PlotTheme -> "Detailed", FrameLabel -> Automatic, 
 ImageSize -> 450, TargetUnits -> {"Attograms", "Kelvin"}]Out[3]=
