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Isotopes
Isotopes are atoms that have different number of neutrons, so they have a different mass number than the other atoms in an element.
1,075 Questions
Are there 2 neutrons in the helium 4 isotope?
Yes. He-4 isotope has 2 protons, 2 electrons and 2 neutrons
What are short-lived isotopes?
Short-lived isotopes are isotopes with relatively short half-lives. Note that short-lived is a relative term, and that means you need to make some kind of comparison to use the term correctly. Let's look at one example using cobalt, which has only one stable isotope, cobalt-59.
We make cobalt-60 by lowering a fixed amount of cobalt-59 into an operating nuclear reactor. It will bathe in the neutron flux there to become activated (neutron activation). The cobalt-59 absorbs a neutron and has been activated to become cobalt-60, which is an unstable isotope of cobalt. That means it is radioactive, and it has a half-life of 5.2714 years. If we look at another isotope, cobalt-58, we find it has a half life of 7.86 days. It's a short-lived isotope of cobalt, compared to cobalt-60. Need another example? Then let's do one more.
In the case of rubidium, the isotope rubidium-85 is the only stable isotope of this metal. Rubidium-87, on the other hand, has a half-life of 4.88x1010 years, which is longer than the estimated age of the universe. (Wow!) The isotopes rubidium-83 and rubidium-84 have half-lives of 86.2 days and 32.9 days, respectively. These two isotopes are short-lived isotopes of rubidium, at least compared to the long-lived rubidium-87 isotope.
There are many isotopes of elements that have been synthesized in the nuclear physics labs, and a lot of them have half-lives of less than one second. The term short-lived isotope is a relative term, and it should be used with that idea in mind. The difference between the two (or more) compared isotopes can be smaller, as in the case of cobalt, or larger, as we showed in rubidium. That difference doesn't have to be specific either, so remember that as well.
We'll depart with the idea that the term "short-lived isotope" is often encountered in medical imaging. The short-lived isotopes referred to usually have half-lives of days or even hours, and are synthesized shortly before use (because they don't last long).
What is the meaninq of two isotopes stable and unstable isotopes?
Isotopes are atoms of the same element that have the same number of protons, but different numbers of neutrons, and therefore different masses. Unstable isotopes are radioactive and undergo radioactive decay of their nuclei, while stable isotopes do not undergo radioactive decay.
An isotope is identified by its atomic mass number which is the total number of?
protons and neutrons in the nucleus of an atom. Isotopes of an element have the same number of protons but different numbers of neutrons. The number of neutrons in an atom affects its stability and often determines its nuclear properties.
Which is an example of a highly unstable isotope that is often used in fission reactions?
Uranium-235 (U-235) is an example of a highly unstable isotope that is used in fission reactions. It undergoes spontaneous fission, releasing a large amount of energy and additional neutrons, which can then go on to induce fission in other uranium atoms, leading to a chain reaction.
Do isotopes have different electrical charges?
No, isotopes have the same electrical charge because they have the same number of protons in their atomic nuclei, which determines the electrical charge. Isotopes only differ in the number of neutrons, which do not have an electrical charge.
Where are isotopes located at?
Isotopes are located within the nucleus of an atom. They are variants of a particular chemical element, having the same number of protons but different numbers of neutrons. Isotopes can exist naturally or be artificially produced.
What is a isotope for hydrogen?
Deuterium is an isotope of hydrogen. It has one proton and one neutron in its nucleus, compared to regular hydrogen which has only one proton. Deuterium is slightly heavier than regular hydrogen and is often used in laboratory experiments and as a tracer in scientific studies.
What atomic particle that determines a specific isotope?
Atoms are electrically neutral. The number electrons and number of protons in neutral atoms are same. The number of neutrons in some atoms are same as the number of protons. Example: Calcium atom contains 20 protons and 20 neutrons.
But some atoms contain same number of protons but different number of neutrons. For example carbon atoms exist in three forms - all contain 6 protons but some contain 6 neutrons, some 7 neutrons and others with 8 neutrons. These type of atoms are known as isotopes
Definition of isotope: Atoms with same number of protons but different number of neutrons
It shows that the different number of neutrons determines the existence of isotopes.
Atoms are electrically neutral. The number electrons and number of protons in neutral atoms are same. The number of neutrons in some atoms are same as the number of protons. Example: Calcium atom contains 20 protons and 20 neutrons.
But some atoms contain same number of protons but different number of neutrons. For example carbon atoms exist in three forms - all contain 6 protons but some contain 6 neutrons, some 7 neutrons and others with 8 neutrons. These type of atoms are known as isotopes
Definition of isotope: Atoms with same number of protons but different number of neutrons
It shows that the different number of neutrons determines the existence of isotopes.
What is the most common instrument used to measure isotope?
The most common instrument used to measure isotopes is a mass spectrometer. Mass spectrometry allows scientists to accurately determine the mass and abundance of isotopes in a sample. It works by ionizing the atoms in the sample and separating them based on their mass-to-charge ratio.
An isotonic solution of sodium chloride has a concentration of 9 g/L.
What is the equation to describe the beta decay of polonium -220?
210 4 214
84 PO -------> 2 alpha + 86 RN
What subatomic particle changes in an isotope?
I'm assuming that by "change" you mean alter the quantity thereof. If you want to actually change a proton into a nuetron and eject a positron, that requires a nuclear reaction.
The protons and neutrons are in the nucleus and serve to define the atom, while the electrons orbit the nucleus and ultimately determine the atom's charge. Electrons can be removed or added with a certain amount of energy. This energy is relatively small compared to the massive amounts required to alter the subatomic particles within the nucleus.
How are the Isotopes of strontium alike?
They have the same number of protons (and of electrons) and so their chemical properties are the same.
How can you determine the number of neutrons in an isotope?
One doesn't generally "calculate" the number of neutrons. The number of neutrons in an atom is always equal to the number of protons, and the number of protons can be found on the Periodic Table of Elements, which can easily be found on the internet or in a science textbook.
Would carbon dating work if carbon-14 atoms did not decay at a constant rate and why?
Statistically carbon-14 atoms decay at a constant rate.
Yes, unless there are twoisotopescoincidentallyhavingthe equal half lives.
How do you find atomic mass and mass number of isotope?
The atomic mass of an isotope is the weighted average of the masses of the naturally occurring isotopes of an element. It is found by multiplying the mass of each isotope by its natural abundance and summing these values. The mass number of an isotope is the total number of protons and neutrons in its nucleus and can be found by rounding the atomic mass to the nearest whole number.
Why does a mass of an atom changes if it an isotope?
yes it does b/c the isotopes have different number of neutrons so therefore isotopes cause a change in mass.
What do all isotopes of hydrogen have in common?
both the atomic number and the atomic mass remain the same.
Do isotopes have identical numbers of protons and electron?
Yes, but they have varying amounts of neutrons.
What are the uses of radioactive isotopes in the field of medicine?
The elements that are radioactive in their most common form are radon, technetium, potassium, and uranium. The most obvious use for radon is the automobile industry. Potassium has both medical and agribusiness uses. Uranium is commonly used as a basic fuel for nuclear reactors. Technetium is used in nuclear medicine and industries
An isotope can be produced if a nucleus gains a neutron or if one of the protons in its nucleus decays into a neutron and positron.
