Rhodium-102

Main isotopes of rhodium

Iso­tope Decay abun­dance half-life (t1/2) mode pro­duct 99Rh syn 16.1 d ε 99Ru γ – 101mRh syn 4.34 d ε 101Ru IT 101Rh γ – 101Rh syn 3.3 y ε 101Ru γ – 102mRh syn 3.7 y ε 102Ru γ – 102Rh syn 207 d ε 102Ru β+ 102Ru β− 102Pd γ – 103Rh 100% stable 105Rh syn 35.36 h β− 105Pd γ –
Standard atomic weight (Ar)	7002102905500000000♠102.90550(2)

Naturally occurring rhodium (₄₅Rh) is composed of only one stable isotope, ¹⁰³Rh. The most stable radioisotopes are ¹⁰¹Rh with a half-life of 3.3 years, ¹⁰²Rh with a half-life of 207 days, and ⁹⁹Rh with a half-life of 16.1 days. Thirty other radioisotopes have been characterized with atomic weights ranging from 88.949 u (⁸⁹Rh) to 121.943 u (¹²²Rh). Most of these have half-lifes that are less than an hour except ¹⁰⁰Rh (half-life: 20.8 hours) and ¹⁰⁵Rh (half-life: 35.36 hours). There are also numerous meta states with the most stable being ^102mRh (0.141 MeV) with a half-life of about 3.7 years and ^101mRh (0.157 MeV) with a half-life of 4.34 days.

The primary decay mode before the only stable isotope, ¹⁰³Rh, is electron capture and the primary mode after is beta emission. The primary decay product before ¹⁰³Rh is ruthenium and the primary product after is palladium.

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