8. Indicate whether the following statements are True or False: a. The common name for the elements in Group 1A is "alkalai metals" a. T F b. All isotopes of the same element have the same number of protons b. T F CA neutron has approximately the same mass as an electron C.T F d. lonization energy tends to decrease from right to left across a period of elements e. Atomic radius tends to decrease in a group moving from top to bottom d. T F e. T F 9. Complete the following table for the neutral element isotopes: Symbol Atomic number Mass number Number of Number of mber of Protons Neutrons Electrons 99 41 29 63 18 17

8. Indicate whether the following statements are True or False: a. The common name for the elements in Group 1A is "alkalai metals" a. T F b. All isotopes of the same element have the same number of protons b. T F CA neutron has approximately the same mass as an electron C.T F d. lonization energy tends to decrease from right to left across a period of elements e. Atomic radius tends to decrease in a group moving from top to bottom d. T F e. T F 9. Complete the following table for the neutral element isotopes: Symbol Atomic number Mass number Number of Number of mber of Protons Neutrons Electrons 99 41 29 63 18 17

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter6: The Periodic Table And Atomic Structure

Section: Chapter Questions

Problem 6.67PAE

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Answer the following questions, assuming that ms, could have three values rather than two and that the rules for n, l, and ml are the normal ones. a. How many electrons would an orbital be able to hold? b. How many elements would the first and second periods in the periodic table contain? c. How many elements would be contained in the first transition metal series? d. How many electrons would the set of 4f orbitals be able to bold?
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What is the difference between core electrons and valence electrons? Why do we emphasize the valence electrons in an atom when discussing atomic properties? What is the relationship between valence electrons and elements in the same group of the periodic table?
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Cerium, as noted in Applying Chemical Principles: 22.3 The Rare Earths, is a relatively abundant lanthanide element that has some important uses. Cerium(IV) oxide. CeO2, is widely used as a polishing agent for glass. Cerium(III) sulfide, Ce2S3, is becoming more widely used as a red pigment to replace cadmium pigments, which are environmentally less desirable. (a) Give the electron configurations (using the noble gas notation) for Ce, Ce3+, and Ce4+. (b) Is either Ce3+ or Ce4+ paramagnetic? If so, how many unpaired electrons does each have? (c) The solid state structure for CeO2 is shown below. Describe the unit cell of the compound. How is this structure related to the formula?