Which transition metal is Synthetic here?

Mo Fe Tc Pm

Tc

The answer is (3), Tc. Technetium (Tc) is the only synthetic transition metal. It is not found naturally on Earth, and it was first synthesized in the laboratory in 1937. The other transition metals, molybdenum (Mo), iron (Fe), and phosphorus (P), are all naturally occurring elements. Here is a table of the synthetic transition metals: Metal Symbol Atomic number Discovery year Technetium Tc 43 1937 Promethium Pm 61 1945 Einsteinium Es 99 1952 Fermium Fm 100 1953 Mendelevium Md 101 1955 Nobelium No 102 1958 Lawrencium Lr 103 1961