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The term half life describes the rate at which the isotopes of a particular atom decay. Thus, if you have a lump of Uranium 238 (U238), then the atoms in the lump will decay at the same rate as the half life. If that lump was created four billion years ago and it consisted of 100% U 238, today the lump would be half U238 and half something else, mostly lead. That would go for both the atoms and the whole lump.
If the lump consisted of 10% U238 today it would consist of 5% U238, and 95% something else. The fact that the U238 has a half life of 4 billion years only affects the Uranium and nothing else.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoNo, it changes for each one.
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Which statement is true about half-lives a Different atoms of the same element have different half-lives. b Each radioactive isotope has its own half-life. c All radioactive nuclides of an element?
The correct answer is: Half-lives are not affected by temperature.
Fluorine 18 has a half life of 110 min so if 200 mg of fluorine 18 is stored at six thirty am how many mg of the isotope is till active at noon?
0 mg they all have the same half life so they all "die".
An isotope of nitrogen could have more protons neutron electrons?
Each isotope has the same number of protons and electrons but a different number of neutrons.
Which statement is true about half-lives?
A. Different atoms of the same nuclide have different half-lives.B. each radioactive nuclide has its own half-life.C. All radioactive nuclides of an element have the same half-life.D. All radioactive nuclides have the same half-life.
Which element has the lowest half-life?
Bismuth has recently been found to have a no stable isotope and has a half-life of 4.6 x 10^19 years. Also, the simple hydrogen atom (a single proton), is theorized to decay at a rate of 6.6 x 10^33 years. So far all tests to observe a proton decay have failed.
Compared to the length of time for the first half-life of a sample of a radioactive isotope the length of time for the second half-life is?
the same
What the difference between radioactivity and half life?
An isotope of a chemical element is an atom that has the same number of protons (this also means this atom has the same atomic number) and electrons, but has a different numbers on neutrons. The isotope is radioactive if it has too many neutrons in the nucleus and because of this the isotope is unstable. The half-life of a radioactive isotope is a time period. When the isotope is at the end of the period it's weight will be the half of the starter weight.
Does the half-life of a material increase with the amount of material present?
The half-life is a fixed period of time: the average time it will take for one of every two atoms to decay to another isotope or element. So no matter how much of a given radioactive isotope that you start with, only one-half of it will still be that isotope after a single half-life period. Likewise only half of that remaining material will be the same isotope after another half-life period. Of course, some of the atoms will be decaying all the time, so the half-life is only a convenient way to define the quantity at any given time.
Does The half-life of a material increases with the amount of material present?
The half-life is a fixed period of time: the average time it will take for one of every two atoms to decay to another isotope or element. So no matter how much of a given radioactive isotope that you start with, only one-half of it will still be that isotope after a single half-life period. Likewise only half of that remaining material will be the same isotope after another half-life period. Of course, some of the atoms will be decaying all the time, so the half-life is only a convenient way to define the quantity at any given time.
Which statement is true about half-lives a Different atoms of the same element have different half-lives. b Each radioactive isotope has its own half-life. c All radioactive nuclides of an element?
The correct answer is: Half-lives are not affected by temperature.
Does the half-life of a radioactive material increase with the amount of material present?
The half-life is a fixed period of time: the average time it will take for one of every two atoms to decay to another isotope or element. So no matter how much of a given radioactive isotope that you start with, only one-half of it will still be that isotope after a single half-life period. Likewise only half of that remaining material will be the same isotope after another half-life period. Of course, some of the atoms will be decaying all the time, so the half-life is only a convenient way to define the quantity at any given time.
What determines the mass of an isotope?
The number of neutrons in the nucleus, the number of protons is the same for each isotope of a given element.
Why need to know the percentage of each isotope of an element to determine the atomic mass?
Because each isotope of an element has a mass different from any other isotope of the same element, and the atomic mass of an element is an average, weighted by the proportion of each isotope, in the naturally occurring element.
Fluorine 18 has a half life of 110 min so if 200 mg of fluorine 18 is stored at six thirty am how many mg of the isotope is till active at noon?
0 mg they all have the same half life so they all "die".
Is an isotope still radioactive after a half life?
Yes, an isotope is still radioactive after one half life. There is simple one half of it left. And there will be one half of that half, i.e. one quarter left after a second half life, and half of that half, i.e. one eight left after a third half life, etc. The equation for half-life is ... AT = A0 2(-T/H) ... where A0 is the starting activity, AT is the ending activity at some time T, and H is the half-life in units of T. Sometimes, you see this equation in other forms, such as with e instead of 2, but there is another factor in the exponent. They are all the same. This equation, with the 2, makes the meaning of half-life clear because a negative power of 2 is simply 1/2, 1/4, 1/8, etc.
Does increasing the drug dosage increase the half life?
No....It will feel stronger and more potent, but the half life remains the same for each drug......I think?
An isotope of nitrogen could have more protons neutron electrons?
Each isotope has the same number of protons and electrons but a different number of neutrons.
