Technetium, atomic structure

Technetium, atomic structure

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This image is part of the sequence science and technology: atomic structure and data for the elements

Credit: CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY

Caption: Technetium (Tc). Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of technetium-98 (atomic number: 43), the most common isotope of this element. The nucleus consists of 43 protons (red) and 55 neutrons (orange). 43 electrons (white) successively occupy available electron shells (rings). Technetium is a transition metal in group 7, period 5, and the d-block of the periodic table. It has a melting point of 2157 degrees Celsius. The transition metal trends are due to electrons filling an inner d-subshell (here, within the 4th ring), shielding the outer (valence) electrons from the increasing nuclear charge.

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