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Chapter 3

First Period Problems

The placement of hydrogen in the Periodic Table is still a cause of dissention. In some versions of the Periodic Table, uniquely among the elements, the hydrogen symbol appears twice. Here, the different proposed locations will be described and contrasted. Though all common versions of the Periodic Table place helium in Group 18, some chemists propose its placement should be in Group 2, based upon electron configuration.

Rouvray has lauded the accomplishments of the Periodic Table [1]:

The periodic table is also deeply reassuring in that it accounts for and assigns a specific position to every element; even elements still waiting to be synthesized have their rightful place awaiting them.

This claim is not quite correct, as