disintegration of a radionuclide accompanied by the emission of ionizing radiation in the form of alpha or beta particles or gamma rays. Strong interaction is a fundamental interaction between elementary particles that causes protons and neutrons to bind together in the atomic nucleus. Also called strong force. The strong force is a short-range attractive force between baryons that holds together the nucleus of the atom. Electromagnetic force is the fundamental force that is associated
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Atoms Atom is the fundamental building block of all stuff‚ or what scientists like to call "matter". An individual atom is very small. In fact‚ the smallest type of atom‚ hydrogen‚ has a diameter of 10-8 cm. Every single object is composed of atoms. Our body is made up of many‚ many individual atoms. There are also many different types of atom. These different types are called elements. Examples of some elements are hydrogen‚ oxygen‚ and helium. Under normal conditions many atoms can stick together
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Polonium is radioactive and present only in extremely low abundances in the environment. It is quite metallic in nature despite its location beneath oxygen in the periodic table. It is made in very small quantities through a nuclear reaction of bismuth. Neutron irradiation of 209bismuth (atomic number 83) gives 210polonium (atomic number 84). 209Bi + 1n ¨ 210Po + e- Polonium-210‚ 210Po‚ transmutes into the lead isotope 206Pb by the emission of an ¿-particle. The half-life for this process is just over
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The PET scan‚ or Positron Emission Tomography‚ was born in 1973 at Washington University. It was created by Edward Hoffman‚ Michael M. Ter-Pogossian‚ and Michael E. Phelps; Phelps is most often credited with the invention (History of PET and MRI‚ 2009). In preparation for a PET scan‚ radioactive tracers are injected into the body‚ inhaled‚ or ingested by the patient through a solution that they drink. Then the scan will actually begin‚ as the patient lies on a table‚ which glides into the machine
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Neon Have you ever known that behind those older television set screens that there were Neon tubes inside? Ever since it was discovered‚ Neon has become more and more popular. From TV tubes to Cryogenics to Neon signs to even lasers. Neon has been a vast element that can be used widely because of its unique chemical and physical properties. Neon has many interesting properties and they include: Neon’s atomic number is ten. It has an atomic mass of roughly 20.180. Represented with the symbol Ne. Neon
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All Single-choice 10 multiple choice material 2. Which pair of atoms/ions has same # of electrons? 32p and 32s 15e 16e- Al 3+ and Cl- 10e- 18e- Xe and I- 54e- 54e- 13C 14N 6e- 7e- ^ the 13 on C is mass number. = # protons + # neutrons. 3. N2 + 2 O2 + Cl2 -> 2 NO2 Start with 6 mol N2‚ 4 mol O2‚ 4 mol Cl2‚ Find limiting reagent and amounts remaining of excess reactants N2 + 2 O2 + Cl 2 6 mol 4 mol 4 mol start Max yield x (2mol No‚Cl/ 1 mol N2) Of No2Cl = 12 mol 4
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Isotopes in Agriculture An isotope is a two or more atom that has different mass number but the same atomic number. An isotope is a variation of an element with a difference in the normal number of neutrons. The increased mass of an isotope can cause the chemical reactions they are used in to progress more slowly than a reaction that does not use isotopes. Not all isotopes are radioactive and there are many uses for them. They can be used in medicine‚ diagnose‚ nutrition‚ agriculture‚ research
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cannot break it any further? Democritus thought is eventually had to be unbreakable. He finally concluded that at some point there is the smallest bit of matter and he called these basic particles atoms. Today we know that Atoms contain protons‚ neutrons‚ electrons‚ and a nucleus. The nucleus is in the center of the atom. It is so small that its diameter is 100‚000 times smaller than its atom. Electrons float around the nucleus and determine the chemistry of an atom. Here’s a fun fact for you. Did
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Today‚ many countries are depending more and more on nuclear energy to produce electricity. Although‚ nuclear energy can bring many benefits‚ such as nuclear fission‚ which releases no carbon dioxide‚ it also brings many risks to many countries that use nuclear energy. This was proved‚ in many disasters that nuclear energy caused years ago‚ like the Chernobyl Disaster in April 26‚ 1986‚ which was said that‚ “the radiation released was to be 200 times that of Hiroshima and Nagasaki nuclear bombs
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STUDY GUIDE ANSWERS The Earth’s History Section 14-2 REVIEW VOCABULARY REVIEW radioactive isotope is an isotope whose nucleus tends to release particles‚ radiant energy‚ or both; radioactive dating is a technique for determining the age of a material by measuring the amount of a particular radioactive isotope the material contains. radioactive decay is the release of particles‚ radiant energy‚ or both by a radioactive isotope half-life is the time it takes for one-half of any size
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