Although the Periodic Table of Elements is an impressive achievement of human understanding, scientists are still finding secrets about certain elements among its carefully arranged rows and columns.

For the first time, scientists have revealed crucial properties of the mysterious, radioactive substance promethium — nearly eight decades after the elusive rare earth element was discovered.

In ancient Greek mythology, the Titan Prometheus was bound to a rock as punishment for stealing fire from the gods and giving it to humans. The rare radioactive element promethium was named after him ...

Conceptual art showing the rare earth element promethium in a vial surrounded by an organic ligand. Scientists have discovered hidden features of promethium, opening a pathway for research on other ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Although the Periodic Table of Elements is an impressive achievement of human understanding, scientists ...