Answer C is radioactive. Nucleus of C is not stable. Here? N lies above the belt of stability of nucleus. One neutron in the nucleus of C converts to a proton with the release of the release of particle. If 12% of a certain radioactive isotope decays in 5.2 years‚ what is the half-life of this isotope? Answer 0.59 yr 1.7 yr 21.7 yr here 28.1 yr Which statement is false? Answer No chemical treatments can make radioactive elements harmless.
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as fission products and some product particles. Uranium or plutonium isotopes are used as a fuel in the nuclear reactor. The amount of energy released from the nuclear bonds is much larger than the amount of energy in a chemical bond. For example‚
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cure cancer. However gamma rays cannot penetrate steel and lead compounds. Also the only living organism which can survive these rays are cockroaches. Gamma rays are radioactive just like bananas. Bananas are radioactive because they contain relatively high amounts of potassium. They contain potassium-40‚ which is a radioactive isotope of potassium. e light. Visible light is like its own mini spectrum inside the spectrum. Starting off with the lonest wavelength is red then its orange‚ yellow‚ green
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Rutherford model (around 1910) Atoms are mostly empty space. Negative electrons orbit a positive nucleus. Ernest Rutherford (movie: 10 min.) • Rutherford shot alpha (α) particles at gold foil. Zinc sulfide screen Lead block Thin gold foil Radioactive substance path of invisible α-particles Most particles passed through. So‚ atoms are mostly empty. Some positive α-particles deflected or bounced back! Thus‚ a “nucleus” is positive & holds most of an atom’s mass. • Electrons orbit the nucleus
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Only about 0.7% of uranium consists of the isotope U-235‚ the fuel source of nuclear reactors‚ but because the cooling process utilized by LWRs absorbs a significant number neutrons required for fission‚ nuclear fuel must be enriched to contain between 3% and 5% U-235. The enrichment process requires
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Nuclear Energy Overview: The Basics of Nuclear Energy — An Overview Nuclear power uses the energy created by controlled nuclear reactions to produce electricity. Fission Nuclear Fission Source: Atomicarchive.com at: http://www.atomicarchive.com/Fission/Fission1.shtml The most commonly used nuclear reaction for power generation is nuclear fission. Nuclear fission is the splitting of an atom’s nucleus into parts (lighter nuclei that are different from the parent and neutrons) by capturing
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tensile stress. Natural occurring and man made Bismuth have a very low ductility. The hardness of Bismuth is 2-2.5. Bismuth has 33 isotopes with mass numbers from 185 to 217. Bismuth-209 is the only stable isotope‚ even with the natural radioactivity. Since Bismuth is slightly radioactive it has a slow rate of Alpha particle decay. Alpha Particle Decay is a type of radioactive decay within an atomic nucleus which emits an alpha particle‚ emitting the alpha particle would be called the decay event‚ and
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Carbon-14 Dating: An Invaluable Yardstick in the Chronology of Humans Archaeologists utilize several methods to analyze data from the past. One scientific tool helps to analyze the radioactive decay of chemical elements found in plant and animal remains‚ pottery‚ and even rocks. Radiocarbon dating‚ also known as carbon-14 dating‚ has developed into one of the most important radioisotope dating methods archaeologists employ. This scientific tool‚ first developed by Willard F. Libby in the late
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symbols – the periodic table ATOMIC NUMBER 6 C SYMBOL OF ELEMENT Carbon NAME OF ELEMENT ATOMIC WEIGHT 12.01 Isotopes • Atoms of the SAME element with a DIFFERENT number of neutrons – Unstable isotopes can be radioactive causing radiation. – In anatomy: • a radioactive isotope can be introduced to trace a metabolic pathway. • Radioactive isotopes can change chemical structures used to treat cancers CARBON Atomic bonding • The goal of bonding is to produce a full
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What You Need To Know for the Chemistry Regents Exam The Test The Chemisty Regents Exam is broken down into three sections: Part A: 35 mulitple choice questions from all units covered over the course of the school year. Part B: Approximately 25 questions‚ with a mix of short answer and multiple choice. Questions focus on the Reference Tables‚ graphing‚ and laboratory experiments. Part C: Approximately 15 short answer questions‚ most broken down into smaller parts. This is often an
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