Israel Science and Technology Homepage Home Search About Contact Bookmark Sort List By Atomic Number Atomic Weight Name Symbol Periodic group‚ Electron configuration Melting point Boiling point Density Ionization energy Abundance in Earth Year of discovery Hebrew Name List of Periodic Table Elements Sorted by Atomic Number Click a column title‚ such as Symbol‚ to sort the table by that item. No. Atomic Weight Name Sym. M.P. ( °C ) B.P. ( °C ) Density* (g/cm3) Earth crust (%)* Discovery
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Continuity States that everything on the same layer are the same age Rule of Original Horzitonality States that the orginal layer was horizontal‚ but over the years became wavy s t n a p i c i t r The Pa ● Radiometric Dating: It has isotopes and those isotopes decay‚ so they date them. ● The Magnetic Field: Has poles and every once in awhile it switches poles ● Index Fossils: If they exist in one layer‚ then
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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 sample of a particular isotope to decay. microsphere is a
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John Dalton was an English chemist‚ physicist‚ and meteorologist. Dalton was born in 1766. He is best known for his work in color blindness‚ and of course‚ his Atomic Theory. His theory gave us an idea about what the universe is really made up of‚ and he paved the way for many more important scientific discoveries after he died in 1844. His theory was simple: He stated that all matter is made of atoms. He based his theory on two laws: the law of conservation of mass and the law of constant composition
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Radioactive isotopes (radioisotopes) are isotopes which are atoms of the same element that are chemically identical but vary in the number of neutrons they contain. Radioactive isotopes can participate in reactions just like non radioactive elements. Autoradiography is a technique used to trace the movements of certain substances around plants. An example of this is carbon 14. Carbon 14‚ a radioactive isotope‚is added to the carbon dioxide supply of the plant‚ to study the movement of products
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(_92^238)U Protons = 92‚ electrons = 92‚ neutrons = 238 – 92= 146 Isotopes Isotopes are atoms of the same element which have the same number of protons but different numbers of neutrons. That is‚ their proton numbers are the same but their nucleon numbers are different. Examples Hydrogen: (_1^1)H: (_1^2)H: (_1^3)H Carbon: (_6^12)C: (_6^14)C Chlorine: (_17^35)Cl: (_17^37)Cl Uranium : (_92^235)U: (_92^238)U Isotopes have the same chemical properties because they have same number of protons
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medicine. There are also some additional areas where we can use radiation which include cancer and commonly called therapy. A subspecialty in nuclear medicine is nuclear medicine therapy. A common example of nuclear medicine therapy is the use of radioactive iodine to treat thyroid problems‚ including thyroid cancer. It also used in oncology which is the branch who works on treatment of cancer. Figure 1.2 x ray view
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Conclusions The purpose of this experiment was to find the relationship between a substance’s specific heat and its atomic weight. In the lab‚ the substances with the higher atomic weights had less specific heat. From this‚ we can conclude that specific heat and atomic weight have an inverse relationship‚ meaning as one decreases the other increases. The reason for this is because if atoms are small‚ or light‚ they have the ability to pack tightly together‚ leaving almost no space between them
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follows. Review: 1. An element’s or isotope’s atomic number tells how many protons are in its atoms. 2. An element’s or isotope’s mass number tells how many protons and neutrons in its atoms. ISOTOPES After reading this section you will be able to do the following: * Define an isotope and explain how it is different than an element. The other particle in the nucleus of an atom is the neutron. The neutron has no electrical charge and is said to be neutral. Like protons‚ all neutrons
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electrical energy. Current Nuclear Power plants require the the use of the rare Uranium isotope U-235 and consequently only use one fifth of the total energy content. Next generation reactors forecast to be available in 2020’s will use all the energy in Uranium or the more abundant Thorium. Nuclear reactors produce vast amounts of radioactive waste including large amounts of very long lived radioactive atoms. These radioactive particles are a product of the splitting of the atom. We are constantly exposed
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