what is the isotops of ir
Q: an element has two natually occuring isotopes, one that has a mass of 8.6254 and makes up 15.56…
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Q: A hypothetical element has two main iso- topes. One has a mass of 73 amu and the other has a mass of…
A: Solution: Given Values, Isotope 1-mass =73 amuIsotope 2-mass =75 amuAtomic weight =73.80…
Q: Iodine-120 has a half life of 1.35 hours. If you start off with a sample which has an activity of…
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Q: A sample containing I-131 has an activity of 6.40 × 108 Bq. How many days later will the sample have…
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Q: What is (a) the atomic number and (b) the atomic mass number of the daughter nucleus produced by the…
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Q: ults vary with the amount of the sample. The decay constant represents a percentage of the sample…
A: Decay constant, proportionality between the size of a population of radioactive atoms and the rate…
Q: What is the approximate size (cm) of a nucleus?
A: The nucleus is found at the center of an atom. It consists of proton and neutron inside it. In 1911…
Q: Element X has 3 isotopes. One of the isotopes has a mass of 59.5 with an abundance of 43.3%. Another…
A: We know that, Average atomic mass of an element is a weighted average of all masses of all isotopes…
Q: What is wrong with the model of a lithium atom and how should it be corrected?
A: I find two wrong things here. 1) The arrangement of protons and neutrons is wrong. Protons are…
Q: The graph above represents the nuclear decay of a radioactive element, measured using a…
A: Graph is given as,
Q: what would be the atomic number of an element that would result from beta particle emission from 46…
A: The atomic number of obtained element in Beta minus decay is 36. The atomic number id obtained…
Q: A radioactive sample is observed for 160 days. After 160 days the amount of the sample is found to…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The rate at which this…
Q: Rutherfordium-261 has a half-life of 1.08 min. How long will it take for a sample of rutherfordium…
A: Given: Half life of Rutherfordium-261 t = 1.08 min.
Q: the abundance 10^(8)percent of iodine in seawater is 5.0 * by mass. How many kilograms of seawater…
A: This problem is based on the concept of mass concentration, which is the amount of a substance…
Q: Half life of protactinium 234
A: Protactinium 234 is a radioactive element with an…
Q: atomic mass unit = 1.661x10-24 grams Technetium-99 has a half-life of 6 hours. Suppose a lab has 80…
A: Half life of Technetium -99 T1/2 = 6 hours Initial amount (mo) = 80 mg Let amount left after t…
Q: 4. Because of its chemical similarity to calcium, 3 Sr can collect in the bones and present a health…
A: Solution:Given:t = duration of time = 47.6 yearsT = half life of 90Sr38 = 28.8 yearsp2 = percentage…
Q: Isotope X has a half-life of 100 days. A sample is known to have contained about 1,500,000 atoms of…
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Q: 12) Compute the approximate nuclear radius of germanium (A = 70)
A: From experimental data, it was found that the density of a nucleus does not depend on the mass…
Q: Elemental carbon has 6 protons and 6 neutrons. This is often described as carbon-12. Carbon-13 has 6…
A: Mass Number = Number of protons + Number of neutrons For Plutonium: Mass Number = 244 Number of…
Q: Draw a model to represent the nucleus of Oxygen 8. 15.999 Oxygen Mass Number 16 %3D
A: Oxygen has an atomic number of 8 and atomic mass of 16. It consists of 8 electrons and 8 protons and…
Q: 13. After two half-lives, how much of the original sample would remain? 50% 6.25% 12.5% 25%
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Q: 64 g of a radioactive substance is prepared. 105 hours later, only 16 g remains. To the nearest…
A: To the nearest hour, the radioactive half-life of the substance is 52.5hours
Q: A nucleus of Plutonium-239 is bombarded with a neutron causing it to produce Xenon-134,…
A: Plutonium-239, produce Xenon-134, Zirconium-103 and 3 neutrons . We want to write the isotopic…
Q: a) The ionic radius of lead is 0.180 nm. What fraction of this volume does the nucleus take up for…
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Q: A radioactive material decomposes half of its amount per minute. If after 2 mins, 100% undecayed…
A: Half of amount decay in 1 min
Q: What is the half life of Technetium?
A: Introduction: The time that a radioactive isotope or a substance takes for half of the isotope to…
what is the isotops of iron(fe) in nature?
find the atomic mass of iron
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- It is handy to have an equation to quickly determine the number of atoms left in a radioactive sample as a function of time. For this we can divide the initial amount by two for every half-life of time, the following equation does exactly that: No No 2 1/2 (21/2) where Nois the initial number of atoms at t=0, t is time passed and is the half-life. Use the above equation to help you answer the question below. Substance X has a half-life of 10 years, if you start with 1000 grams, how much will be left after 100 years? (Give your answer in units of grams)12. The half-life of Calcium-47 is 3.91 x 105 seconds. A sample contains 4.11 x 1016 nuclei. How much of the sample is left after 7.82 x 105 seconds? 2.57 x 1015 nuclei 5.14 x 1015 nuclei 2.06 x 1016 nuclei 1.03 x 1016 nucleiBoron has two naturally occurring isotopes, boron-10, andboron-11. Boron-10 has a mass of 10.0129 relative tocarbon-12 and makes up 19.78 percent of all naturallyoccurring boron. Boron-11 has a mass of 11.00931 comparedto carbon-12 and makes up the remaining 80.22 percent. What isthe atomic weight of boron?
- Would you kindly explain step by step as you answer the following question... A sample of material contains one milligram of Iodine-131. Iodine -131 has a half - life of 8.02 days. Find:a) The number of atoms of iodine-131 initially presentb) The activity of the sample in becquerelWhat mass of fluorine -18. (F-18) is an activity of 10mCi? How long will it take for the activity to decrease to 0.15mCi?A radioactive sample was measured 9.1 years ago. It had an activity of 9783.8 Bq. Today, its activity is 21 Bq. What is the half-life (in years) of this substance?
- 90 6. Because of its chemical similarity to calcium, Sr can collect in the bones and present a health risk. What percentage 90 90 of Sr present initially still exists after 47.5 y?(The half life of Sr is 28.8 years) 38 % 60 so £60 3 ssf60 sk f60 ssfAfter production, a 300µl solution with a specific activity of 50 GBq/ml was torn. Delivery timeis 1 day. The half-life of the isotope is 4 days. Find the amount of solution that needs to besent so that the customer has 3.0 GBq at the date of delivery.A periodic table might list the average atomic mass of magnesium as being 24.312 u, which is the result of weighting the atomic masses of the magnesium isotopes according to their natural abundances on Earth.The three isotopes and their masses are 24Mg (23.985 04 u), 25Mg (24.985 84 u), and 26Mg (25.982 59 u). The natural abundance of 24Mg is 78.99% by mass (that is, 78.99% of the mass of a naturally occurring sample of magnesium is due to the presence of 24Mg).What is the abundance of (a) 25Mg and (b) 26Mg?