Tranter hesitated. “Well, the next information after the atomic weight ought to be the period and group numbers. But those are words.”
“What would the numbers be for the first one, hydrogen?”
“Period One, Group One. One electron shell, one electron in the outer shell,” Tranter told her. “Helium’s period one, too, but it has the outer—only—electron shell full, so it’s in the group of inert elements.”
“Trav, Trav. Trav’s the first month of the year. And helium’s Trav, Yenth; Yenth is the eighth month.”
“The inert elements could be called Group Eight, yes. And the third element, lithium, is Period Two, Group One. That check?”
“It certainly does. Sanv, Trav; Sanv’s the second month. What’s the first element in Period Three?”
“Sodium. Number Eleven.”
That’s right; it’s Krav, Trav. Why, t
