Isotopes Definition and 92 Threads

I tried to find the ratio of rb88/rb87 but can't find any. What are the ratio of rb88/rb87 in nature?

TL;DR Summary: Ag mass number 108+1 neutron (mass number 1) =Beta -1 does this equal Cadmium or Mercury? 'Chemistry An Atoms Based Approach' problem 2.97 (c) says the answer is Hg mass number 110 I came up with Cadmium is this a typo?

https://frib.msu.edu/news/2024/new-isotopes Physcial Review Letters https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.072501 198Pt atoms of 186 MeV/u were directed onto a carbon target; primary beam power was 1.5 kW. https://frib.msu.edu/

I am trying to get a plot, or a result for target like this: I've found some equations for my requested results, but they are from the same person's articles and I couldn't find another source. I've searched for EOB and TTY calculations but couldn't really do something. Could you give me an...

Say one was to create an artificial stable isotope of Promethium as it has predicted applicable properties. What would it’s number have to be? I know Promethium-147 is semi-stable.

Hello all, I am looking to get an electronic copy of the Table of Radioactive Isotopes by Edgardo Browne and Richard B. Firestone. I know that we can run software that incorporates this database here: https://www2.lbl.gov/LBL-Programs/Gamquest.html , but I am looking for an electronic copy to...

Homework Statement:: Understanding radioactivity levels of different isotopes Relevant Equations:: None Hi, This isn't a homework problem but is an introductory question. Could someone explains what makes one isotope more radioactive than another isotope assuming you have the same amount of...

Hi, I found the two sections in red a little confusing. I'd appreciate it if you could help me with it. Source: https://en.wikipedia.org/wiki/Atomic_mass#History The existence of isotopes was first suggested around 1913[reference]. The first periodic table by Mendeleev in 1869 used...

So, a website in which I just enter an element or an Isotope and it just lists all the relevant experimental data like mass, mass-defect binding energy etc. Also resources for the absorption data, resources to explore Monte-Carlo simulations, and other calculation tools would be awesome. Just a...

Hello, because of the "kinetic isotopic effect", https://en.m.wikipedia.org/wiki/Kinetic_isotope_effect can the ratio of the common isotopes of N, C, P, H, O, S determine the position of an individual in the food chain? (eg, have carnivore animals higher proportion of light isotopes than...

Hi, Does a T-D or a D-D fusion release more energy? Even if D-D needs higher temperatures, would it produce more energy in a fusion reactor?

Homework Statement Compare Dipole moment of CH3F and and CD3F where D is deuterium. Homework Equations Theory questions The Attempt at a Solution Our sir had explained that to do this question we muat take into account the vibration of the atom in the respective molecule. That is that the...

How can radioactive decay be random if we can calculate aproximately when it will happen . For example we know that an isotope will decay every 2 years by calculating the half life . Doesnt that mean that the decay is systematic rather than random because we can calculate when its guna happen ...

Does terrestrial spontaneous fission or natural fission create unstable isotopes similar to nuclear fission in reactors?

https://en.m.wikipedia.org/wiki/Isotope Can Isotopes be useful to Agriculture industry viz Fertilizers & Instecticides manufacturing? Thanks & Regards, Prashant S Akerkar

Homework Statement Silver has two naturally occurring isotopes: Ag−107 with a mass of 106.905 amu and a natural abundance of 51.84 %, and Ag−109. Use the atomic mass of silver listed in the periodic table to determine the mass of Ag−109. express answer to 4 sig-figs and use appropriate units...

On the page https://en.wikipedia.org/wiki/Isotopes_of_uranium, some of the superscripts have, besides the atomic number, also an "m". For example, besides the usual isotope 234U with spin 0+, there is also the isotope 234mU (with nuclear spin 6-). What is this "m"? While I am at it, what is the...

I was looking at this neat graph of all the isotopes and which ones are stable and how they decay: https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Table_isotopes_en.svg/715px-Table_isotopes_en.svg.png The black squares represent stable isotopes, and columns that have no such black...

Hello I would like to know more about the history of the discovery of the isotopes, what there was before, and the short term impact on the chemistry and nuclear physics. Is this topic discussed in any book/review? Thank you for your time. Regards, ORF

Hello,something I've always had some confusion with is the vast number of radioactive isotopes that form from fission and subsequent decay of the fissioned nuclei. first of all does anyone have a link or something to a good high resolution picture of a chemical elements periodic table kind of...

Hello there, I have a question that I just can't seem to solve by myself (although compared to the other threads here it seems quite simple) I did some FDG-PET scans for my master thesis: I inject a certain dose of F18-FDG and prepare these injections by measuring the right dose using a...

I am doing a study guide for a nuclear chemistry introductory course FINAL EXAM. A few of the questions have me confused because, although they are asked in a multiple-choice format, the prof. has indicated that multiple choices may be correct for given problems and that you must not only choose...

Read more at: https://phys.org/news/2017-01-paper-spotlights-key-flaw-widely.html#jCp Robert B. Hayes. Some Mathematical and Geophysical Considerations in Radioisotope Dating Applications, Nuclear Technology (2017). DOI: 10.13182/NT16-98 (Requires purchase or subscription)

Judging by https://en.wikipedia.org/wiki/Critical_mass , californium-252 has the lowest critical mass among known isotopes and isomeres. But it is still very high. Is there a way to reduce it significantly (down to microgramms) or, perhaps, a semi-stable isotope/isomere, which would have such a...

why uranium does not have any stable isotope?

For example the activity of U-238 and U-234 in an uranium series is the same. Isn't activity depends on decay constant and the amount of atoms? Why must the activities equal and what is the reason behind?

Homework Statement The diagram shows a mass spectrometer used for measuring the masses of isotopes. It consists of an ion generator and accelerator, a velocity selector and an ion separator, all in a vacuum. In one experiment, tin ions, each of which carries a charge of +1.6 * 10-19 C, are...

Homework Statement Suppose the element A contains three isotopes, 86A (atomic mass 85.909 u, abundance 16.19%) 87A (atomic mass 86.908, abundance 7.00%) and 88A (atomic mass 87.906 u). What would be the atomic mass of A that would appear in the periodic table? Homework Equations (A1 x %A1) +...

After a nuclear explosion in the environment remains a lot of half-life of a radioactive isotope . Which of them pose the greatest danger to people , find themselves in the same place after a certain time ? why?

Homework Statement Suppose the electric field between the plates P and P' in the mass spectrometer in following figure is 1.89×104V/m and the magnetic field in both regions is 0.668 T. If the source contains the three isotopes of krypton, 82Kr,84Kr, and 86Kr, and the ions are singly charged...

if protons don't have any for of charge and aren't attract to the nucleus then why are there isotopes?

I am trying to solve the following problem for my graduate course in isotope geochemistry. If 1 g of 226Ra is separated from its decay products and then placed in a vessel, how much helium (cm3) will accumulate in the vessel in 60 days? Here is what I know. The decay series from 226Ra to Lead...

Homework Statement If a radioactive isotope ends with 55.5 g, and has a half-life of 2.5 days, how much was there 8.3 days ago? Homework Equations mf=mi(1/2^t/h) The Attempt at a Solution the answer i got was 554 g, is it correct?

I have been looking at half-life of various isotopes and many of the tables / information I am finding is giving energies (MeV, KeV) for certain half lifes. This does not make sense to me, am I missing something ? For example : http://ie.lbl.gov/toi/listnuc.asp?sql=&A1=5&A2=5 5Li and 5He give...

I am looking for tabular view of all isotopes (*.xls, *.csv, *.ods , ... ). Preferably with as much information as possible - half life, mean life, decay constant, specific activity, ... Any thoughts on where this might exist. I am wondering about correlations between stability and different...

A neutral atom of radium isotope may be represented by: 228 Ra (88 proton number, 228 nucleon number). 88...

I have this true and false question: " The half life and therefore the decay constant will be the same for every isotope a) True b) False c) only if it is an isotope of the same element " I think this is false, just by intuition.

I thought I would ask this question in the quantum mechanics section as I presume it has something to do with QM, like the reason why alpha and beta decay do not happen immediately but instead there is a half life for this decay. My understanding is that with alpha decay, the strong nuclear...

Homework Statement Current share of Uranium isotope on Earth is 99.28% (##^{238}U##) and 0.72% (##^{235}U##), half-life times are ##7.04\cdot 10^8 years## (##^{235}U##) and ##4.468\cdot 10^9 years## (##^{238}U##). Calculate the ratio between the isotopes ##4.5\cdot 10^9 years## ago...

I'm in year 10 and I have been studying physics and chemistry. When I learned isotopes, I notice that for isotopes, the number of neutron is always higher than that of proton. Is it possible that there are isotopes that the number of neutron is lower than that of proton? If no, is that because...

Dear all I'm trying to find the separative work units (SWU) required to enrich isotopically Tungsten. I've come across the SWU equation (http://www.fas.org/programs/ssp/nukes/effects/swu.html) SWU = P·V(Np) + W·V(Nw) – F·V(Nf) where V(x)=(2x-1)ln(x/(1-x)) and x is the...

Homework Statement Please help me solve this problem... Given T(1/2) of U-235 = 7.04x10^8 yrs (0.7%) T(1/2) 0f U-238 = 4.468x10^9 yrs (99.3%) Calculate percentage of U-235 & U-238 at the time of creation of earth(~4.5 billion years ago) Homework Equations N(t) = No e^(-λt) The...

I realize that Palladium has a molecular property to hold immense amounts of hydrogen, but can Palladium also “hold” isotopes of hydrogen.

Casual searches for muonic atoms brings up various experiments on muonic hydrogen. The physics of this atom is fairly simple because the muon is just a heavier version of an electron. Has anyone studied atoms with both an electron and a muon around a nucleus, such a helium isotope? In this case...

There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of molecules, and the mass of a molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of consists of three peaks: Mass Relative Size 157.836 0.2569 159.834...

Why do some isotopes occur naturally even though a seemingly valid decay with non-negligible energy release ~Mev, could energetically happen? E.g. Cadmium-106 could decay to Palladium-106 but it is still NATURALLY occurring?

Ive been researching for a while now and i still can't understand why neutrons rich isotopes are unstable. As neutrons act like the glue and hold protons together as they increase the Strong Nuclear force that act upon protons and neutrons, i thought the more neutrons the stronger they would...

The spin values of each isotope of carbon are given on wiki here. When showing nuclear spin values the notation (1/2+)# is used. I don't understand what the () brackets and # hashtag are for? At the bottom of the page, they clarify it by saying: "Values marked # are not purely...

Would the observed half-life of a sample of a radioactive isotope (eg. iodine 131) be different from the nominal half-life when it is cooled down to a temperature near absolute zero. Have there been any experiments conducted to examine this question?