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According to Joseph Mattauch's isobar rule, why does Technetium (43) not have any stable isotopes?

Question #149160. Asked by BigTriviaDawg.
Last updated Mar 18 2023.
Originally posted Mar 18 2023 6:11 PM.

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psnz star
Answer has 2 votes
psnz star
4 year member
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Answer has 2 votes.
According to the Mattauch isobar rule (1934), if two adjacent elements in the periodic table have isotopes with the same mass number, then one of them will be radioactive. The mass number (or isobar) is the total of protons and neutrons in an atomic nucleus.

Since technetium (atomic number 43) has the same mass number as its neighbouring elements Mo and Ru (for a range of isotopes) there are no stable nuclides for 43 protons under this rule.

link https://wiki2.org/en/Mattauch_isobar_rule+Milds.2

Mar 18 2023, 6:23 PM
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