April 2020
Intermediate to advanced
296 pages
5h 20m
English

Short-lived ’n’ scarce in pitchblende ore, just 1 pg per ton,
Then Oak Ridge raked its fissile core and out popped 61!
This lanthanoid’s unstable so,
Its “beta bits” help’d paint to glow . . .
. . . they also help to “set the pace” for hearts to smoothly run.
pee-jee
FIFTH IN THE LANTHANOID SERIES
Promethium is the only radioactive element within the lanthanoid family of rare-earth metals in row 6 of the periodic table (see “Scandium, Sc” on page 60 for information on the rare earths). It occurs naturally—although very scarcely!—as a decay ...