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Index Entry
Ninety-Two Elements: Periodic Regularities Of:
"Of the ninety-two
Of those heretofore unexpected chemical elements
Had as yet been discovered
And physically isolated
By humans on Earth-- . . .
Mendeleyev, attempting scientifically
To find an order
In which to set
The first fifty-two chemical elements
Inadvertently uncovered
A previously unknown
System of regularities
Common to all fifty-two,
Which, if their implied generalization
Proved in due course
To hold true,
Would require the presence in Universe
Of the additional unknown forty
To fill in the membership vacancies
Occurring in the revealed periodic behaviors
Of the already discovered chemical elements.
