Technetium was the first element ever discovered artificially, not in nature.

Its name comes from the Greek word technetos, meaning “artificial.”

Technetium has no stable isotopes. Every form of it is radioactive.

It was discovered in 1937, making it one of the later elements added to the periodic table.

Its atomic number is 43, the first missing element in the original periodic table. Dmitri Mendeleev predicted its existence decades before it was discovered and originally called it “eka manganese.”

Technetium is extremely rare in Earth’s crust.

Any technetium found naturally comes from uranium decay, not primordial sources.

A typical human body contains less technetium than a grain of sand, usually none at all.

It is a silvery gray metal that tarnishes slowly in moist air.

Technetium behaves chemically like rhenium and manganese.

The most important isotope is technetium 99m. Technetium 99m is used in millions of medical imaging scans every year and is one of the most commonly used radioactive materials in medicine. It emits gamma rays that are ideal for imaging while causing relatively low damage. Its half life of about six hours makes it perfect for diagnostic use.

Doctors use technetium to scan the heart, bones, brain, lungs, and kidneys.

Technetium helps detect cancer, fractures, and organ function issues.

It is produced in nuclear reactors, not mined.

Technetium was discovered by bombarding molybdenum with neutrons.

No sample of technetium existed on Earth when the planet formed.

Technetium can help prevent corrosion in steel and is sometimes studied for use in anti corrosion coatings.

Technetium sits in the transition metals group and has poor electrical conductivity compared to its neighbors.

Technetium compounds are often brightly colored, including reds, yellows, and greens.

The element helped confirm that not all elements are primordial.

Astronomers have detected technetium in red giant stars, proving that stars actively create new elements. Its presence helped validate the theory of stellar nucleosynthesis.

Technetium is one of only two elements lighter than uranium with no stable isotopes. The other is promethium.

Technetium is rarely handled outside controlled laboratory environments.