. Technetium is not found naturally on Earth; it must be synthesised in the laboratory. Nonetheless, because it is radioactive, it has valuable medical uses. a) In what group and period of the periodic table is technetium found? b) The valence electrons of technetium are found in 5s and 4d subshells. What is a set of quantum numbers (n,  and m) for one of the electrons in the 5s subshell? c) Technetium emits a γ-ray (gamma-ray) with energy of 0,141 MeV. (1 MeV = 1 million electron volts, where 1 eV = 9,6485 x 104 J/mol.) What are the wavelength and frequency of a γ-ray photon with energy of 0,141 MeV

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