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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GROUP 4