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Here's a definition of radioactive elements and as well as the list of common radioactive elements.
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Common
Radioactive
Elements
Radioactive elements are elements that have an unstable nucleus. When the nuclei are considered unstable they radiate alpha, beta, and gamma radiation and is converted into a stable element. Elements are considered radioactive if they are either artificially made or have no stable isotopes.
Luminous watchX-ray
Uranium glass/ Vaseline glass
Smoke detector
Ceramics Glass lantern mantle
HYDROGEN (H)Atomic number 1Atomic mass number 3Decay type Beta Decay (β-)Half life 12 years
RADIUM (Ra)Atomic number 88 Atomic mass number 225Decay type Beta Decay (β-)Half life 15 days
Radium (Ra)Atomic number 88 Atomic mass number 224Decay type AlphaHalf life 4 days
Uranium (U)Radioacti
ve element
Atomic number
Atomic mass
number
Decay type
Half life
Uranium (U)
92 233 Alpha 162,000 years
Uranium (U)
92 234 Alpha 248,000 years
Uranium (U)
92 235 Alpha 713 million years
Uranium (U)
92 236 Alpha 23.9 million years
Uranium (U)
92 238 Alpha 4.51 billion years
Polonium (Po)Atomic number 84Atomic mass number 210Decay type AlphaHalf life 138 days
Carbon (C)Atomic number 6Atomic mass number 14Decay type Beta Decay (β-)Half life 5,730 years
Technetium (Tc)Atomic number 43Atomic mass number 99Decay type Beta Decay (β-), Gamma
Half life 210,000 years
Iodine (I)Radioac
tive element
Atomic number
Atomic mass
number
Decay type
Half life
Iodine (I) 53 129 Beta Decay (β-), Gamma
17.2 million years
Iodine (I)v 53 131 Beta Decay (β-), Gamma
8 days
Iodine (I) 53 134 Beta Decay (β-), Gamma
52 minutes
Lead (Pb)Atomic number 82Atomic mass number 210Decay type Beta Decay (β-), Gamma
Half life 21 years
Cesium (Cs) 134 & 137Atomic number 55Atomic mass number 134, 137
Decay type Beta Decay (β-), Gamma
Half life 2 years, 30 years
Plutonium (Pu) 239Atomic number 94Atomic mass number 239Decay type AlphaHalf life 24,390 years
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