Assertion: technetium | /r/HasProperty | the element of atomic number
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Source sentences:
text: Note: The element was named by the Italian mineralogist Carlo Perrier (1886-1948) and the Italian-American physicist Emilio Segrè (1905-89), who had earlier isolated isotopes; see C. Perrier and E. Segrè, "Technetium: the element of atomic number 43," Nature, vol.