What is the rate constant for the decay of uranium-238?
&lambda1 is the uranium(235) decay constant — 9.72×10-10 yr-1, and &lambda2 is the uranium(238) constant — 1.54 x 10-10 yr-1.
How long does uranium-238 take to decay?
4.5 billion years
The half-life of uranium-238 is 4.5 billion years. It decays into radium-226, which in turn decays into radon-222. Radon-222 becomes polonium-210, which finally decays into a stable nuclide, lead.
What is the decay product of uranium-238?
The nuclear disintegration of uranium-238 forms radium-226 which disintegrates to form radon gas (radon-222). Radon decays to form a series of daughter nuclides, most of which are alpha-particle-releasing isotopes, such as polonium-210.
How long will it take uranium-238 to reduce by 25%?
It also shows that after a little over 4 billion years there are only 50 grams of uranium remaining. It has the shape of a decreasing exponential graph and we can also verify that after 9 billion years (two half-lives) there are about 25 grams remaining.
How many protons does uranium-238 have?
92 protons
The most stable isotope of uranium, U-238, has an atomic number of 92 (protons) and an atomic weight of 238 (92 protons plus 146 neutrons).
How many protons does uranium-238?
Does uranium-238 decay in a predictable fashion?
It is a radioactive isotope that decays in a predictable fashion. It can date organic samples that are thousands of years old.
Is uranium 238 unstable?
All isotopes of uranium are unstable and radioactive, but uranium 238 and uranium 235 have half-lives which are sufficiently long to have allowed them to still be present in the Solar System and indeed on Earth.
How many protons does uranium 238?
How do you find the decay of uranium 238?
This is just an example of how to calculate the radioactivity of an isotope from its halflife. Uranium 238 has a halflife of 4.468×109 years (4,468,000,000years). This is 4.468×109 x 365.25 x 24 x 60 x 60 = 1.41×1017 seconds. So we get a decay constand of ln(2) / 1.41×1017 =4.916×10-18 per second.
https://www.youtube.com/watch?v=F8sAkMQmOlU