but neutron number may vary‚ so mass number (protons + neutrons) may vary. However‚ the same element may contain varying numbers of neutrons; these forms of an element are called isotopes. The chemical properties of isotopes are the same‚ although the physical properties of some isotopes may be different. Some isotopes are radioactive-meaning they "radiate" energy as they decay to a more stable form‚ perhaps another element half-life: time required for half of the atoms of an element to decay into
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implications of nuclear medicine and evaluates the dangers associated with it. ISOTOPES: WHAT ARE THEY? Many of the known chemical elements have a number of isotopes. (Gothard‚ 2004) Isotopes can be referred to as a ‘species’ of the base element‚ however‚ unlike elements‚ they feature a differing mass number‚ meaning the amount of protons and neutrons is imbalanced. (Gothard‚ 2004) Sometimes‚ an isotope exists with an unstable nucleus‚ spontaneously emitting excess energy through radiation
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Chapter 3 Atoms and Elements 1 3.1 Elements and Symbols Chemistry: An Introduction to General‚ Organic‚ and Biological Chemistry‚ Eleventh Edition Copyright © 2012 by Pearson Education‚ Inc. Elements 2 Elements are • pure substances that cannot be separated into simpler substances by ordinary laboratory processes • the building blocks of matter • listed on the inside front cover of this text Chemistry: An Introduction to General‚ Organic‚ and Biological Chemistry‚ Eleventh Edition Copyright
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Testable Question: What will happen to different halide salts found in the body if various compounds are added to the halide? How will the halides react? Introduction: For this lab we tested 6 halide salts found in the body‚ and their reactivity when a compound is added. We tested the halides NaF‚ NaCl‚ KBr‚ KI‚ and two unknown halides. To find the reaction of the halide‚ we are adding drops of Ca(NO3)2‚ AgNO3‚ AgNO3 + Na2S2O3‚ and NaOCI + Starch to the halides. Each halide will be separated from
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from that time period. Paleocimatologists observe the oxygen in the ice\water molecules. Most of the oxygen atoms are in two forms called isotopes the two different isotopes are 18o and 16o which stand for 18-oxygen and 16-oxygen. The proportions of these two are really similar but different 18o is slightly heavier than 16o. The proportions of these two isotopes depend on the average temperatures. Snow that falls during warmer climates cause a greater proportion of 18o and snow that is fallen during
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atom. 3) What is an isotope? Give an example (show how it is an isotope). An isotope is a form of the same atom that differs from the original atom in atomic mass. The charge of the atom will remain the same‚ but the atomic mass is changed because the atom has a different number of neutrons. For example‚ there is such a thing as carbon 12‚ carbon 13‚ carbon 14…etc. These are all the same element‚ but they differ in mass‚ making them isotopes of carbon. Carbon always has 6 protons
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thirty six in the periodic table it is in group eighteen period four. It is a part of the noble gas series. Its atomic number is thirty six and its atomic mass is eighty three point seven nine eight. It has forty eight neutrons in its most sufficient isotope that are in four different electron shells. It was discovered by Chemist Sir William Ramsay and Morris Travers in the year eighteen ninety eight. It was found in London when Sir William Ramsay made a statement that there had to be more elements because
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has a short half life of 6.03 hours which makes storage difficult and transporting impossible. Therefore‚ it is shipped by pharmaceutical companies directly to local market using A 99mTc generator. It is a device that is used to take the metastable isotope 99mTc of technetium from 99Mo which has a half-life of 66 hours which is used to transport over long distances to hospitals. This provides shield for long distance transport to minimize extraction work (Wagner‚
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9.2.5 Chemistry past paper questions 2001 Question 16 (3 marks) Radioisotopes are used in industry‚ medicine and chemical analysis. For ONE of these fields‚ relate the use of a named radioisotope to its properties. Medicine – Iodine Ingested iodine concentrates in the thyroid gland and so iodine 131 can treat thyroid disorders (e.g. tumours) Iodine 131 has a half life of just over 8 days‚ emits beta particles and gamma rays as it decays. This half life is long enough for it to be transported form
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will try to present some of beneficial applications of radioactivity. • Probably the most significant usage of radioactivity is in medicine. It is used in diagnostic scintigraphy‚ which is a study to asses organ function. Most frequently used‚ isotope of technetium-99m allows the quick removal of the radioisotope from the body and minimizes the risk of possible complications. Unlike X-ray studies‚ which better illustrates the structure of the organ‚ scintigraphy allows accurate diagnosis of its
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