[Kalzium] [Bug 120150] Kalzium 'Plot Data' treats missing values as if equal to zero

[Vincent A.Patrick]

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------- Additional Comments From vap chem com au  2006-01-15 13:38 -------
Either approach is better than the current plot. As you say, skipping 
the missing value would be the ideal.

Some of the data points will probably never be obtained satisfactorily, 
such as the density of francium. This makes me wonder whether it might 
be worthwhile to place in *estimates* as points of a different 
colour/shape. For example, an approximation of the density for francium 
is 2.0 g.cm-3, and an approximation for the density of astatine is 7.5 
g.cm-3.

Incidentally, the boiling point of polonium appears to be 1235 K. Would 
it be any help if I looked up some of the other values such as atomic 
radii in various reference books, or is that being taken care of?