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Radioactive iodine 131 has a half life of eight days The amount of a 200.0 gram sample left after 32 days would be?
Wiki User
∙ 12y ago
You start with 5 grams- every 8 days, half of what is there goes away. At 8 days. there will be 2.5 grams. At 16 days, half of THAT is gone- now down to 1.25 grams. At 24 days, half of THAT is gone, leaving 0.625 grams. At 32 days, you have half of 0.625 grams. so divide .625 by two and you get .3125.
Wiki User
∙ 9y ago
Wiki User
∙ 6y agoWe know that there are 3 half-lives of that iodine isotope in 24 days, so the 4 milligrams becomes 2 milligrams, which becomes 1 milligram which becomes 0.5 milligrams after 24 days.
Wiki User
∙ 9y agoThe amount of a 200.0 gram sample left after 32 days would be 12.5g.
Wiki User
∙ 6y agoWe have found that the half-life of iodine-131 is 8.0197 days, or just a bit over 8 days and 28 minutes.
Wiki User
∙ 12y ago12.5 g
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Radioactive iodine-131 has a half-life of eight days. The amount of a 200.0 gram sample left after 32 days would be -?
12.5 g
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No. Radioactive elements are normally a result of the atom actually being an isotope of that element. An isotope is an atom of an element that has a different amount of neutrons than the norm. For example, the normal amount of neutrons in a Carbon atom is six, but Carbon-14 has eight, and Carbon-16 has ten. These isotopes are normally radioactive.
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What radioactive element has six electrons and eight neutrons?
The element is carbon and the isotope is 6C14
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Half-life is the length of time required for half the atoms in a radioactive sample to decay to some other type of atom. It is a logarithmic process, i.e. in one half-life, there is half the sample left, in two half-lives there is one quarter the sample left, in three half-lives there is one eight left, etc. The equation is... AT = A0 2 (-T/H) ... where A is activity, T is time, and H is half-life.
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Examples: hydrogen, iron, iodine, thorium, palladium, niobium, francium, boron.
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the oil industry
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Twenty-eight million, eight thousand, thirteen and nine tenths.
Eight elements that make up most of earth continental crust?
Arsenic, Boron, Neodymium, Sodium, Carbon, Iodine, Potassium, and the one with the smallest concentration of the eight; uranium you should also know that i am lieing
Eight ball mjg Coming out hard old school sample?
simply red: holding back the years
A radioactive isotope has eight neutrons Write the atomic number and mass number of this radioactive nitrogen as a chemical symbol with a subscript and superscript?
The atomic number of nitrogen is 7. When it is a radioactive isotope you add the number of neutrons to the atomic number (equaling 15). You then write 15 over 7 next to a capital 'N' representing Nitrogen.
