Principles Of Radiographic Imaging: An Art And A Science
6th Edition
ISBN: 9781337711067
Author: Richard R. Carlton, Arlene M. Adler, Vesna Balac
Publisher: Cengage Learning
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Another major use of bismuth has been as an ingredient in low-melting metal alloys, such as those used in firesprinkler systems and in typesetting. The element itself is a brittle white crystalline solid. How do these characteristicsfit with the fact that bismuth is in the same periodic group with such nonmetallic elements as nitrogenand phosphorus?
Look up antimony in the periodic table 1Z = 512. How many covalent bonds would you expect it to form? Based on this information, which of the following antimony compounds is covalent and which is ionic: SbCl3 or SbCl5?
Element Z forms an ion Z 3+, which contains 31 protons. What is the identity of Z, and how many electrons does Z3+have?
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- What if there are a different number of Neutrons? Sometimes elements have a different number of neutrons than usual, so therefore have a different atomic mass. This is what we call an Isotope (a variant form of an element which has the same number of protons but a differing number of neutrons). Sometimes we’ll see Isotopes labeled with their new mass like this: 14C = this is Carbon 14. Notice it has a different mass than what is on your periodic table The average mass of all the isotopes is defined as an element’s Atomic Weight. Can you answer questions about these Isotopes? ELEMENT ATOMIC MASS NUMBER OF PROTONS NUMBER OF NEUTRONS 14C A B C 15N D E F 2H G H I Use your table to look up the number of protons, remember that never changes!arrow_forwardHow many different elements are there in the molecule?arrow_forwardCompound A has molecular formula C7H7X. Its 1H-NMR spectrum shows a singlet at 2.25 ppm and two doublets, one at 7.28 ppm and one at 7.39 ppm. The singlet has an integral of three and the doublets each have an integral of two. The mass spectrum of A shows a peak at m/z = 126 and another peak at m/z = 128; the relative height of the two peaks is 3:1 respectively. Identify what atom X is, explaining your reasoning and identify Compound A, explaining your reasoning.arrow_forward
- Look up the valence electron configuration, covalent atomic radius, effective nuclear charge, first ionization energy and Pauling electronegativity in Chapter 8 (tables are attached). Examine the above data and answer the following questions. a) Explain why some of the elements like TI and Pb on the lower left of the p block are metallic. b) Explain why some of the elements like C, Si in the center of the p block form covalent bonds. Explain why these bonds formed by the network of these elements (as studied in Chapter 25) tend to be unreactive. c) Explain why the noble Group 8A elements are highly unreactive gases. d) Explain why some elements like F, CI, Br etc, on the upper right of the p block are highly reactive nonmetals.arrow_forwardwhat makes Isotopes of an element different from one another?arrow_forwardHow does the atomic structure or composition of the versions of sodium in question C above differ from a typical sodium atom, with its atomic mass of 23?arrow_forward
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- Do a web search to identify each of the following elements>isotopes and indicate the number of neutrons, protons, and electrons in an atom of the element>isotope:arrow_forwardA compound with empirical formula C2H5O was found in a separate experiment to have a molar mass of approximately 90 g. What is the molecular formula of the compound?arrow_forwardWhy do the 3s, 3p, and 3d orbitals have the same energy in a hydrogen atom but different energies in a many- electron atom?arrow_forward
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