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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
This is the isotope zirconium-93 (51 n + 2 n =53 n plus 40 p).
This isotope is lead-206.
How do atoms of neon 20 and 22 differ?
Both have 10 protons and 10 electrons.
Ne-20 has 10 neutrons
Ne-22 has 12 neutrons
Ne-20 and Ne-22 are examples of isotopes
What are some of the roles of isotopes?
- Isotopes are used as sources of radiation in medicine, sterilization, nondestructive control, etc.
- Isotopes can be used as tracers
- Isotopes can be used as energy source
- Isotopes are used for radioactive dating
- Isotopes are used in chemical analysis
- Isotopes are used in many instruments
- Isotopes are used as source of nuclear energy in bombs and nuclear reactors
etc.
Isotopes have same number of electrons. They have same number of protons, so their atomic numbers are same. They have different numbers of neutrons resulting different mass numbers.
- treatment by irradiation in cancers
- scintigraphy
- source in positron emission tomography
- tracers
How many protons neutrons and electrons in Fe3?
The Fe(3+) cation has 26 protons, 30 neutrons (for the isotope Fe-56) and 23 electrons.
How is silicon converted to aluminium then to magnesium iron and nickel?
You can't do this in chemistry. You can't change one element into another. Elements can be converted to others deep inside stars, but this is mostly the production of heavier atoms from lighter ones.
Are compound and isotope the same?
No.
Compounds are comprised of 2 or more atoms bonded together. For example, water is H2O, containing two hydrogen atoms and one oxygen atom per molecule.
Isotopes are atoms of the same atomic number, i.e. they have the same number of protons in their nuclei, but differ only in the number of neutrons in the nuclei (e.g. carbon-12 has 6 protons and 6 neutrons, while carbon-14 also has 6 protons, but has 8 neutrons.
What is the nuclear equation of americium?
The nuclear reactions are:
Pu-239(2n, gamma)Pu-241(beta)Am-241
Which of the atoms in the table are isotopes of krypton Kr?
Natural isotopes of krypton are: Kr-78, Kr-80, Kr-81, Kr-82, Kr-83, Kr-84, Kr-86.
Are oxygen and ozone are isotopes if not what are they?
No, they are different forms of the same element, so they are allotropes. Oxygen contains two atoms per molecule and ozone contains three atoms per molecule. Isotopes are atoms of the same element with different numbers of neutrons, such as oxygen-16 and oxygen-17.
Why can gaseous isotopes of an element can be separated by diffusion?
Each isotope has a characteristic mass that is distint from the mass of any other isotope. An isotope with a lower mass difuses more rapidly than one with a higher mass. Although the difference is usually small,many sequential diffusion stages can result in an almost pure sample of one isotope. This was the method by which the uranium-235 isotope in natural uranium was sufficiently concentrated to make the first atomic bomb.
Do isotopes of the same element react the same way?
Chemically isotopes (excepting H,D,T) are identical.
Do isotopes that decay really disappear explain?
They don't so much disappear as become converted to a different isotope - as they throw off particles. If you took the remaining material and added the mass of the particles released as radiation, you should still get the same mass as the original material before the radioactive decay.
Is the decay of unstable isotopes always the same process?
Yes, for the specified isotope; but the process is statistic.
How you find subatomic particles for ions and isotopes?
Subatomic particles are protons, neutrons and electrons.
Can isotopes have positive and negative charges?
Isotopes are just the different possible nuclear weights of each element. Some are stable; some are unstable and radioactive.
Since all atoms are isotopes and all isotopes are atoms, Isotopes can - and do - form ions, consequently they can have positive and negative charges.
How do the physical properties of isotopes of the same element compare?
The number of neutrons is different; the differences between physical properties exists but are extremely small.
Do isotopes of an elements form similar compounds with atoms of other elements?
Absolutely yes, all isotopes of an element are chemically identical in the compounds they form as the chemistry is determined by the configuration of the electrons in the outer shell, which is completely unaffected by the number of neutrons inside the nucleus.
What is affected in chemistry by different isotopes is reaction rates: compounds containing heavier isotopes react slower than compounds containing lighter isotopes. The most extreme case of this is heavy water, which reacts so slowly compared to ordinary water that it inhibits many reactions necessary for life!
Technically the answer is false, however the answer most tests accept as the correct answer is True.
According to Nuclear theory when a parent undergoes decay and produces a daughter isotope the daughter may be stable or it may be unstable and further decay until a final stable granddaughter isotope is formed. This process is called a decay chain, however since eventually a stable isotope is formed the acceptable answer is True, even though technically it is not the case.
9. 3 from the atomic ions- H+, D+, T+ plus 6 molecular ions as listed
What is the lightest element having naturally occurring isotopes that undergo alpha decay?
Samarium-146 is the lightest element found naturally on earth to undergo Alpha emission. There are no accompanying gamma radiations.
Source: Chemistry: The Practical Science, Volume 10 By Paul B. Kelter, Michael D. Mosher, Andrew Scott
Tellurimum- 106 to 110 will be the answer if artificially made isotopes are included.
What is the half life of an Egyptian papyrus with 63 percent of its original carbon-14 atoms?
The question is improperly asked. Papyrus does not have a half-life. Carbon-14 does. Half-life is constant, not variable, in this case, about 5730 years.
So, the question would be more properly asked as "what is the age of an Egyptian papyrus with 63 percent of its original carbon-14 atoms?"
The equation for radioactive decay is...
AT = A0 2(-T/H)
... where A0 is the starting activity, AT is the activity at some time T, and H is the half-life, in units of T.
Substituting what we know, we get...
0.63 = (1) 2(-T/5730)
Solve for T...
log2(0.63) = -T/5730
T = -log2(0.63)(5730)
T = 3819 (conservatively rounded, T = 3800)
