From Arsenic to Zirconium

TECHNETIUM, Tc

WHEN BERKELEY “BOMBED”

“Note well that gap ’neath manganese!” Dimitri oft did say,

When Berkeley “bombed,” the gap was filled by Carlo and Segrè.

’Tis man-made now in tons on Earth . . .

. . . yet red giant stars proclaim its birth;

Its short-lived metastable state spots cancers by decay.

“Note well that gap ’neath manganese!” Dimitri oft did say,

GROUP 7 RADIOACTIVE TRANSITION METAL

[’neath: preposition — underneath]

The Russian chemist Dimitri Mendeleev (1834–1907) drafted his first periodic table of the then-known elements in 1869. He populated the elements in order of increasing atomic weight and also on his observation of ...