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mesothorium
[ mez-oh-thawr-ee-uhm, -thohr-, mes-, mee-zoh-, -soh- ]
noun
, Chemistry.
- one of two radioactive decay products of thorium, an isotope of radium or actinium.
mesothorium
/ ˌmɛsəʊˈθɔːrɪəm /
noun
- obsolete.physics either of the two radioactive elements which are decay products of thorium. Mesothorium I is now called radium-228. Mesothorium II is now called actinium-228
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