5- The cover of the car's engine is called a hood. The hood is coated with an insulator toreduce thermal conductivity.A- Which element in the periódic table would you recommend using in coating thehood? Explain by defining and applying electronic configuration.B- Relate your choice of elements for coating the hood to the effective nuclear chargeand the shielding effect.C- What is the relation between ionization energy and elements that are poorconductors of heat? Explain.

The hood is coated with foam . This foam is insulator composed polystyrene, which is a vinyl…

5- The cover of the car's engine is called a hood. The hood is coated with an insulator to reduce thermal conductivity. A- Which element in the periódic table would you recommend using in coating the hood? Explain by defining and applying electronic configuration. ive nuclear charge

5- The cover of the car's engine is called a hood. The hood is coated with an insulator to reduce thermal conductivity. A- Which element in the periódic table would you recommend using in coating the hood? Explain by defining and applying electronic configuration. ive nuclear charge

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter7: The Structure Of Atoms And Periodic Trends

Section7.6: Periodic Trends And Chemical Properties

Problem 1.2ACP

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6.95 A metallic sample is known to be barium, cesium, lithium, or silver. The electron binding energies for these metals are listed in the following table. Metal Electron Binding Energy(J) Barium 4.301019 Cesium 3.111019 Lithium 3.941019 Silver 7.591019 One way to identify the element might be through a photoelectric effect experiment. The experiment was performed three times, each time using a different laser as the light sources. The results are summarized below. (The Kinetic energy of the ejected photoelectrons was not measured.) Laser Wavelength Photoelectrons Seen? 532 nm No 488 nm Yes 308 nm Yes Based on this information, what conclusions can be drawn as to the identity of the metal?
6.72 LED bulbs offer a fairly new lighting alternative, and are becoming increasingly popular in home lighting. These bulbs combine excellent energy efficiency with the “warm” light and dimming ability of incandescent lights. Although LED bulbs are expensive, manufacturers claim that subsequent savings will more than offset the initial costs. Analyze the relative cost of incandescent versus LED lighting, assuming that the information in the table below is accurate. Are industry claims of cost savings justified? LED Incandescent Initial cost $4.00 $0.75 Electricity usage 8 watts 60 watts Electricity cost $0.04/kwh $0.04/kwh Lifetime 25,000 hours 1,500 hours
Answer the following questions as a summary quiz on this chapter. (a) The quantum number n describes the ________ of an atomic orbital, and the quantum number describes its ________. (b) When n = 3, the possible values of are _________. (c) What type of orbital corresponds to = 3? ________ (d) For a 4d orbital, the value of n is _______, the value of is ________, and a possible value of m is _________. (e) Each of the following drawings represents a type of atomic orbital. Give the letter designation for the orbital, give its value of , and specify the number of planar nodes. Letter = ______ ______ value = ______ ______ Planar nodes = _______ ______ (f) An atomic orbital with three planar nodes through the nucleus is a(n) ______ orbital. (g) Which of the following orbitals cannot exist according to modem quantum theory: 2s, 3p, 2d, 3f, 5p, 6p? (h) Which of the following is not a valid set of quantum numbers? (i) What is the maximum number of orbitals that can be associated with each of the following sets of quantum numbers? (One possible answer is none. ) (i) n = 2 and =1 (ii) n = 3 (iii) n = 3 and = 3 (iv) n = 2, = 1, and m = 0
5- The cover of the car’s engine is called a hood. The hood is coated with an insulator to reduce thermal conductivity. (Refer to the link Resource 7 & Resource 10). A- Which element in the periodic table would you recommend using in coating the hood? Explain by defining and applying electronic configuration. B- Relate your choice of elements for coating the hood to the effective nuclear charge and the shielding effect. C- What is the relation between ionization energy and elements that are poor conductors of heat? Explain.
The cover of the car’s engine is called a hood. The hood is coated with an insulator to reduce thermal conductivity. Which element in the periodic table would you recommend using in coating the hood? Explain by defining and applying electronic configuration. Relate your choice of elements for coating the hood to the effective nuclear charge and the shielding effect. What is the relation between ionization energy and elements that are poor conductors of heat? Explain.
Detailed calculations show that the value of Zeff for the outermostelectrons in Si and Cl atoms is 4.29+ and 6.12+, respectively.(a) What value do you estimate for Zeff experienced bythe outermost electron in both Si and Cl by assuming coreelectrons contribute 1.00 and valence electrons contribute0.00 to the screening constant? (b) What values do you estimatefor Zeff using Slater’s rules? (c) Which approach gives amore accurate estimate of Zeff? (d) Which method of approximationmore accurately accounts for the steady increase inZeff that occurs upon moving left to right across a period?(e) Predict Zeff for a valence electron in P, phosphorus, basedon the calculations for Si and Cl.
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7.24 The electron configuration of B is 1s22s2 , 2p1. (a) Ifeach core electron (i.e., the 1s electrons) were totallyeffective in shielding the valence electrons (i.e., the2s and 2p electrons) from the nucleus and the valenceelectrons did not shield one another, what would be theshielding constant (σ) and the effective nuclear charge(Zeff) for the 2s and 2p electrons? (b) In reality, theshielding constants for the 2s and 2p electrons in B areslightly different. They are 2.42 and 2.58, respectively.Calculate Zeff for these electrons, and explain thedifferences from the values you determined in part (a).
26) Give the symbol of an element that has 6 unpaired electrons.
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Electronic configuration of elements upto atomic no. 71
Note from the following table that there is a significant increasein atomic radius upon moving from Y to La, whereasthe radii of Zr to Hf are the same. Suggest an explanation forthis effect.