FTP, name this element first discovered in a sample of molybdenum that had been bombarded with deuterons at Berkeley by Carlo Perrier and Emilio Segre
In 1952, American astronomer Paul Merrill discovered that the 99 isotope of this element is present in S-type stars.  It also occurs in the Earth's crust in minute traces from the spontaneous fission of uranium, but its short half-life -- one and a half million years for the 98 isotope -- means it could not have been an original consitutuent element on Earth. FTP, name this element first discovered in a sample of molybdenum that had been bombarded with deuterons at Berkeley by Carlo Perrier and Emilio Segre (SEG-ray).
In 1952, American astronomer Paul Merrill discovered that the 99 isotope of this element is present in S-type stars.  
Technetium