Reactor at the Idaho National Laboratory; and these findings were reported in 1954. The high spontaneous fission rate of californium-252 was observed in these samples. The first experiment with californium in concentrated form occurred in 1958. The isotopes californium-249 to californium-252 were isolated that same year from a sample of
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1. One medical use of radioactivity is the treatment of cancer. Yes‚ radiation therapy is utilized for treatment of many types of cancers. Radiotherapy: a method to destroy cancer cells by irradiation with radioactive isotopes or X-rays. a. Explain briefly how radioactivity can cure some types of cancer. beta particles can cure skin cancer but not inside the body The main scooby dooby on this is that the biological damage done to some kinds of cells by exposure to radiation
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electrons. protons. neutrons. isotopes. Question 2 of 20 The structural unit that retains the properties of an element is the molecule. atom. cell. electron. Question 3 of 20 Which of the following are found in the nucleus of an atom? Protons Neutrons Electrons A and B Question 4 of 20 The component of an atom or molecule that is most important in determining its chemical properties is the isotope. neutron. electron. proton. Question
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attempt to set up a policy with Great Britain and Canada‚ to exceed the movement of explosive materials to be made for the use of a similar weapon. This weapon was in essential‚ component of the post chemical uranium-235. By any means the respective isotope has had several methods‚ changes and physical forces that was to be explored during this time. Originally studying of many methods‚ Philip Hauge Abelson‚ developed a third method called thermal diffusion. The production of these methods were put into
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very dangerous it can easily be stopped by a sheet of paper‚ it also has a mass and a positive charge. Beta radiation also is not as dangerous as gamma radiation. It has a mass and a negative charge and can be stopped by a thick wall or bricks.. Isotopes are two or more forms of the same element that have an equal number of protons but
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later discovered to be incorrect was the part where atoms could not be divided into smaller pieces. New research has proved that atoms can be sub-divided into sub-atomic particles like protons‚ neutrons and electrons. 2) Due to the discovery of isotopes it has been discovered that atoms of the same element are not exactly identical. They have different masses due to the number of neutrons. 3) Also it has been discovered that different elements have the same mass. These elements are called isobars
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RATE OF REACTIONS. The reaction rate (rate of reaction) or speed of reaction for a reactant or product in a particular reaction is intuitively defined as how fast or slow a reaction takes place. For example‚ the oxidative rusting of iron under the atmosphere is a slow reaction that can take many years‚ but the combustion of cellulose in a fire is a reaction that takes place in fractions of a second (right). Chemical kinetics is the part of physical chemistry that studies reaction rates. The concepts
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Name: ___________________________ 1. ____ According to the wave-mechanical model of the atom‚ electrons in an atom (1) travel in defined circles (3) have a positive charge (2) are most likely found in an excited state (4) are located in orbitals outside the nucleus 2. ____ What is the total charge of the nucleus of a carbon atom? (1) –6 (2) 0 (3) +6 (4) +12 3. ____ When an atom loses one or more electrons‚ this atom becomes a (1) positive ion with a radius smaller than the radius of this atom (2)
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<b>Thesis Statement</b><br>The hydrogen bomb is a nuclear weapon in which light atomic nuclei of hydrogen are joined together in an uncontrolled nuclear fusion reaction to release tremendous amounts of energy. The hydrogen bomb is about a thousand times as powerful as the atomic bomb‚ which produces a nuclear fission explosion about a million times more powerful than comparably sized bombs using conventional high explosives such as TNT.<br><br><b>The Hydrogen Bomb</b><br>The Atomic Bomb Was A Essential
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Scribd Extrascore Sample Questions - Answers Q.1: What are the µlaws of chemical combination¶? Ans: There are two important laws of chemical combination established by Lavoisier‚are as follows: (i) Law of Conservation of Mass The law of conservation of mass states that mass can neither be created nor destroyedin a chemical reaction.(ii) Law of Constant Proportions The Law of Constant Proportions which is also known as the Law of DefiniteProportions‚ was established by Proust
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