A Substance Is On Its Fifth Half-Life. Which Approximates The Percentages Of Radioactive And Stable Isotopes, Respectively?. When a substance undergoes radioactive decay, the amount of the original radioactive isotope remaining can be calculated using the formula: Converting this to a percentage, 3.1% is the remaining radioactive material while 96.9%.

The formula to find the remaining radioactive material is (1/2)ⁿᵘᵐᵇᵉʳ ᵒᶠ ʰᵃˡᶠ⁻ˡᶦᵛᵉˢ, meaning (1/2)⁵ is 0.031. When a substance undergoes radioactive decay, the amount of the original radioactive isotope remaining can be calculated using the formula: Converting this to a percentage, 3.1% is the remaining radioactive material while 96.9%.