Radioactive The element that has unstable isotope (release proton and electron all the time) therefore its mass is reduce continuously (change to another element) Haft life = a time that each radioactive element reduce its biomass to 50%
radioactive the element that has unstable isotope ( release proton ( electron all the ยังได้คะแนน its ความซับซ้อน is [ continuously ( change ไม่แน่ใจ another แบกซ์เตอร์ haft life = a ยังไม่ radioactive element สามารถ [ biomass to 50 %