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Q: What radioactive substance has the longest half-life?
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How do you determine the half life of a radioactive substance that has changed through radioactive decay After 40 days the original substance left is is one sixteenth of the original amount?

the halflife is 10 days


A substance is labeled as being radioactive The substance is?

Radioactive.


Is any isotope of lead is radioactive?

many. one example is lead-214 with a halflife of 26.8 minutes.


How would you describe the isotopes of hydrogen?

All atoms of a specific element have the same number of protons in their nucleus, but the number of neutrons in the nucleus may vary these are isotopes of that element.Hydrogen has several possible isotopes, only the first three of these are commonly referred to:hydrogen or protium or hydrogen-1, 1 proton 0 neutrons, stabledeuterium or hydrogen-2, 1 proton 1 neutron, stabletritium or hydrogen-3, 1 proton 2 neutrons, radioactive halflife 12.26 yearshydrogen-4, 1 proton 3 neutrons, radioactive halflife about 139 yoctosecondshydrogen-5, 1 proton 4 neutrons, radioactive halflife about 910 yoctosecondshydrogen-6, 1 proton 5 neutrons, radioactive halflife 290 yoctosecondshydrogen-7, 1 proton 6 neutrons, radioactive halflife 23 yoctosecondsetc.


What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?

halflife


What is the difference between a non-radioactive substance and a radioactive substance?

Radioactive substances are unstable as a result of the extra neutrons present in the nuclei of the substance. Non-radioactive substances are stable.


Is it true that the half-life of a radioactive isotope decreases as the isotopes decay?

no, halflife is a constant for each isotope's decay process.


What if your cat is radioactive with the same halflife as carbon 14. how many years will it take for three fourths of your cat to degrade?

my grandma


How do scientists use the halflife of radioactive isotopes to date rocks and fossils?

The basic idea is to compare the abundance of a naturally occurring radioactive isotope within a material to the abundance of its decay products; it is known how fast the radioactive isotope decays.


Is radioactive waste a pure substance or a mixture?

Radioactive waste is nearly always a mixture but it is possible to be a pure substance.


What is a radio substance?

A radioactive substance emit nuclear radiations.


Is plutonium a radioactive substance?

Yes