Mesothorium



[mez-oh-thawr-ee-uh m, -thohr-, mes-, mee-zoh-, -soh-] /ˌmɛz oʊˈθɔr i əm, -ˈθoʊr-, ˌmɛs-, ˌmi zoʊ-, -soʊ-/

noun, Chemistry.
1.
one of two radioactive decay products of thorium, an isotope of radium or actinium.
/ˌmɛsəʊˈθɔːrɪəm/
noun
1.
(physics, obsolete) 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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