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.
We 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.
The amount of a 200.0 gram sample left after 32 days would be 12.5g.
We have found that the half-life of iodine-131 is 8.0197 days, or just a bit over 8 days and 28 minutes.
12.5 g
12.5 g
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.
Huh? Every element can potentially be radioactive.Here is a list of all of the naturally occurring (above trace levels) radioactive elements:bismuthpoloniumastatineradonfranciumradiumactiniumthoriumprotactiniumuranium
The element is carbon and the isotope is 6C14
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.
Examples: hydrogen, iron, iodine, thorium, palladium, niobium, francium, boron.
the oil industry
All radioactive isotopes decay at their own rate, yes. It is expressed as "half life", the length of time it takes for the isotopes radioactivity to drop by 1/2. For some trans-uranic elements, the half life is measured in thousandths of a second. But, for plutonium, it is millions of years. For radium, it is 1600 years. For iodine, it is eight days. Each one is different.
Twenty-eight million, eight thousand, thirteen and nine tenths.
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
simply red: holding back the years
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.