#23, 26,30,32,33,35,41,44,46,54,57,61,63 i need help 6:22 1l LTECh 2 Textbook Probl...Yttrium-90 is used in the treatment_of cancer, particuRny HonHodgkin's lymphoma.19. Cerium is the most abundant rare earth metal. Pure cerium ignites whenscratched by even a soft object. It has four known isotopes: "Ce (atomic mass= 135.907 amu), "Ce (atomic mass - 137.905 amu), "Ce (atomic mass =139.905 amu), and 4Ce (atomic mass = 141.909 amu). Ce-140 and Ce-142 arefairly abundant. Which is the more abundant isotope?20. Consider the three stable isotopes of oxygen with their respectiveatomic masses: O-16 (15.9949 amu), O-17 (16.9993 amu), O-18 (17.9992 amu).Which is the most abundant?(a) How many protons are there in an atom of Y-90?(b) How many neutrons?(c) Write the nuclear symbol (2X) for Y-90.9. How do the isotopes of Cu-63 and Cu-65 differ from each other? Writenuclear symbols for both.10. Consider two isotopes Fe-54 and Fe-56.(a) Write the nuclear symbol for both isotopes.(b) How do they differ from each other?55QUESTIONS AND PROBLEMS21. Gallium has two naturally occurring isotopes: “Ga, with atomic mass68.9257 amu, and "Ga, with atomic mass 70.9249 amu. The percent abun-dance of "Ga can be estimated to be which of the following?(a) 0% (b) 25%22. Rubidium has two naturally occurring isotopes: "Rb (atomic mass =84.9118 amu) and "Rb (atomic mass = 86.9092 amu). The percent abundanceof "Rb can be estimated to be which of the following?36. Consider an isotope of yttrium, Y-90. This isotope is incorporated intocancer-seeking antibodies so that the cancer can be irradiated by the yttriumand destroyed. How many neutrons are in(a) twenty-five atoms of yttrium?(b) one nanogram (10-° g) of yttrium?37. A cube of sodium has length 1.25 in. How many atoms are in that cube?(Note: d = 0.968 g/cm³.)38. A cylindrical piece of pure copper (d = 8.92 g/cm') has diameter1.15 cm and height 4.00 inches. How many atoms are in that cylinder? (Note: thevolume of a right circular cylinder of radius r and height h is V = wr'h.)(c) 50%(d) 75%(c) 50%(а) 0% (Ь) 25%23. Strontium has four isotopes with the following masses: 83.9134 amu(0.56%), 85.9094 amu (9.86%), 86.9089 amu (7.00%), and 87.9056 amu(82.58%). Calculate the average atomic mass of strontium.24. Silicon is widely used in the semiconductor industry. Its isotopes and(d) 75%Elements and the Periodic Tableabundances are:Give the symbols for(a) potassium(d) antimonyName the elements represented by39.27.977 amu(c) aluminumSi-2892.34%(b) cadmiumSi-2928.977 amu4.70%(e) phosphorus29.974 amu2.96%Si-3040.What is the average atomic mass of silicon?25. Naturally occurring silver (Ag) consists of two isotopes. One of the iso-topes has a mass of 106.90509 amu and 51.84% abundance. What is the atomicmass of the other isotope?26. Copper has two naturally occurring isotopes. Cu-63 has an atomic massof 62.9296 amu and an abundance of 69.17%. What is the atomic mass of thesecond isotope? What is its nuclear symbol?27. Chromium (average atomic mass = 51.9961 amu) has four isotopes.Their masses are 49.94605 amu, 51.94051 amu, 52.94065 amu, and 53.93888amu. The first two isotopes have a total abundance of 87.87%, and the lastisotope has an abundance of 2.365%. What is the abundance of the third iso-tope? Estimate the abundances of the first two isotopes.28. Magnesium (average atomic mass = 24.305 amu) consists of three iso-topes with masses 23.9850 amu, 24.9858 amu, and 25.9826 amu. The abun-dance of the middle isotope is 10.00%. Estimate the abundances of the otherisotopes.29. Neon consists of three isotopes, Ne-20, Ne-21, and Ne-22. Their abun-dances are 90.48%, 0.27%, and 9.22%, respectively. Sketch the mass spectrum(a) S41. Classify the elements in Question 39 as metals (main group, transition,or post-transition), nonmetals, or metalloids.42. Classify the elements in Question 40 as metals (main group, transition,or post-transition), nonmetals, or metalloids.43. How many metals are in the following groups?(a) Group 1How many nonmetals are in the following periods?(a) period 245. Which group in the periodic table(a) has one metalloid and no nonmetals?a (b) has no nonmetals or transition metals?(c) Se(d) Si(Ь) Sc(e) Sr(c) Group 17(b) Group 1344.(c) period 6(b) period 4(c) has no metals or metalloids?46. Which period of the periodic table(a) has no metals?(b) has no nonmetals?(c) has one post-transition metal and two metalloids?Molecules and lonsfor neon.30. Chlorine has two isotopes, Cl-35 and Cl-37. Their abundances are75.53% and 24.47%, respectively. Assume that the only hydrogen isotope47. Given the following condensed formulas, write the molecular formulasfor the following molecules.(a) dimethylamine (CH,);NH(b) propyl alcohol CH,(CH;);OHpresent is H-1.(a) How many different HCl molecules are possible?(b) What is the sum of the mass numbers of the two atoms in eachWrite the condensed structural formulas and molecular formulas for the48.molecule?following molecules. The reactive groups are shown in red.(c) Sketch the mass spectrum for HCl if afl the positive jons are ob-tained by removing a single electron from an HC! molecule.31. Lead is a heavy metal that remains in the bloodstream, causing mentalretardation in children. It is believed that 3 × 10-7 g of Pb in 1.00 ml of bloodis a health hazard. For this amount of lead how many atoms of lead are therein one mL of a child's blood?32. Silversmiths are warned to limit their exposure to silver in the air to1X 10-* g Ag/L of air in a 40-hour week. What is the allowed exposure interms of atoms of Ag/L/week?33. Determine(a) the number of atoms in 0.185 g of palladium (Pd).(b) the mass of 127 protons of palladium.34. How many protons are in(a) ten atoms of platinum?(b) ten grams of platinum?35. The isotope Si-28 has a mass of 27.977 amu. For ten grams of Si-28,н(а) Н-С—С-о(acetic acid)нО-нН(b) Н—С—СI(methyl chloride)нGive the number of protons and electrons in(a) an N; molecule (identified in 1772).(b) an N, unit (synthesized in 1890).(c) an Ng* unit (synthesized in 1999).(d) an N,N, salt (a U.S. Air Force research team's synthesis project).Give the number of protons and electrons in the following:49.50.(b) So,- ion.(d) S?- ion.(a) S, molecule.(c) H;S molecule.calculate(a) the number of atoms.(b) the total number of protons, neutrons, and electrons.Atoms, Molecules, and lons56CHAPTER TWOWrite the names of the following ionic compounds.(b) Sr(OH);64.5L Complete the table below. If necessary, use the periodic table.(c) KMNO,(a) ScCl,Number oftel Na.CO.Aumber oÉ.becafNotificationsInboxDashboardCalendarTo Do

Question

#23, 26,30,32,33,35,41,44,46,54,57,61,63 i need help 6:22 1l LTECh 2 Textbook Probl...Yttrium-90 is used in the treatment_of cancer, particuRny HonHodgkin's lymphoma.19. Cerium is the most abundant rare earth metal. Pure cerium ignites whenscratched by even a soft object. It has four known isotopes: &#34;Ce (atomic mass= 135.907 amu), &#34;Ce (atomic mass - 137.905 amu), &#34;Ce (atomic mass =139.905 amu), and 4Ce (atomic mass = 141.909 amu). Ce-140 and Ce-142 arefairly abundant. Which is the more abundant isotope?20. Consider the three stable isotopes of oxygen with their respectiveatomic masses: O-16 (15.9949 amu), O-17 (16.9993 amu), O-18 (17.9992 amu).Which is the most abundant?(a) How many protons are there in an atom of Y-90?(b) How many neutrons?(c) Write the nuclear symbol (2X) for Y-90.9. How do the isotopes of Cu-63 and Cu-65 differ from each other? Writenuclear symbols for both.10. Consider two isotopes Fe-54 and Fe-56.(a) Write the nuclear symbol for both isotopes.(b) How do they differ from each other?55QUESTIONS AND PROBLEMS21. Gallium has two naturally occurring isotopes: “Ga, with atomic mass68.9257 amu, and &#34;Ga, with atomic mass 70.9249 amu. The percent abun-dance of &#34;Ga can be estimated to be which of the following?(a) 0% (b) 25%22. Rubidium has two naturally occurring isotopes: &#34;Rb (atomic mass =84.9118 amu) and &#34;Rb (atomic mass = 86.9092 amu). The percent abundanceof &#34;Rb can be estimated to be which of the following?36. Consider an isotope of yttrium, Y-90. This isotope is incorporated intocancer-seeking antibodies so that the cancer can be irradiated by the yttriumand destroyed. How many neutrons are in(a) twenty-five atoms of yttrium?(b) one nanogram (10-° g) of yttrium?37. A cube of sodium has length 1.25 in. How many atoms are in that cube?(Note: d = 0.968 g/cm³.)38. A cylindrical piece of pure copper (d = 8.92 g/cm') has diameter1.15 cm and height 4.00 inches. How many atoms are in that cylinder? (Note: thevolume of a right circular cylinder of radius r and height h is V = wr'h.)(c) 50%(d) 75%(c) 50%(а) 0% (Ь) 25%23. Strontium has four isotopes with the following masses: 83.9134 amu(0.56%), 85.9094 amu (9.86%), 86.9089 amu (7.00%), and 87.9056 amu(82.58%). Calculate the average atomic mass of strontium.24. Silicon is widely used in the semiconductor industry. Its isotopes and(d) 75%Elements and the Periodic Tableabundances are:Give the symbols for(a) potassium(d) antimonyName the elements represented by39.27.977 amu(c) aluminumSi-2892.34%(b) cadmiumSi-2928.977 amu4.70%(e) phosphorus29.974 amu2.96%Si-3040.What is the average atomic mass of silicon?25. Naturally occurring silver (Ag) consists of two isotopes. One of the iso-topes has a mass of 106.90509 amu and 51.84% abundance. What is the atomicmass of the other isotope?26. Copper has two naturally occurring isotopes. Cu-63 has an atomic massof 62.9296 amu and an abundance of 69.17%. What is the atomic mass of thesecond isotope? What is its nuclear symbol?27. Chromium (average atomic mass = 51.9961 amu) has four isotopes.Their masses are 49.94605 amu, 51.94051 amu, 52.94065 amu, and 53.93888amu. The first two isotopes have a total abundance of 87.87%, and the lastisotope has an abundance of 2.365%. What is the abundance of the third iso-tope? Estimate the abundances of the first two isotopes.28. Magnesium (average atomic mass = 24.305 amu) consists of three iso-topes with masses 23.9850 amu, 24.9858 amu, and 25.9826 amu. The abun-dance of the middle isotope is 10.00%. Estimate the abundances of the otherisotopes.29. Neon consists of three isotopes, Ne-20, Ne-21, and Ne-22. Their abun-dances are 90.48%, 0.27%, and 9.22%, respectively. Sketch the mass spectrum(a) S41. Classify the elements in Question 39 as metals (main group, transition,or post-transition), nonmetals, or metalloids.42. Classify the elements in Question 40 as metals (main group, transition,or post-transition), nonmetals, or metalloids.43. How many metals are in the following groups?(a) Group 1How many nonmetals are in the following periods?(a) period 245. Which group in the periodic table(a) has one metalloid and no nonmetals?a (b) has no nonmetals or transition metals?(c) Se(d) Si(Ь) Sc(e) Sr(c) Group 17(b) Group 1344.(c) period 6(b) period 4(c) has no metals or metalloids?46. Which period of the periodic table(a) has no metals?(b) has no nonmetals?(c) has one post-transition metal and two metalloids?Molecules and lonsfor neon.30. Chlorine has two isotopes, Cl-35 and Cl-37. Their abundances are75.53% and 24.47%, respectively. Assume that the only hydrogen isotope47. Given the following condensed formulas, write the molecular formulasfor the following molecules.(a) dimethylamine (CH,);NH(b) propyl alcohol CH,(CH;);OHpresent is H-1.(a) How many different HCl molecules are possible?(b) What is the sum of the mass numbers of the two atoms in eachWrite the condensed structural formulas and molecular formulas for the48.molecule?following molecules. The reactive groups are shown in red.(c) Sketch the mass spectrum for HCl if afl the positive jons are ob-tained by removing a single electron from an HC! molecule.31. Lead is a heavy metal that remains in the bloodstream, causing mentalretardation in children. It is believed that 3 × 10-7 g of Pb in 1.00 ml of bloodis a health hazard. For this amount of lead how many atoms of lead are therein one mL of a child's blood?32. Silversmiths are warned to limit their exposure to silver in the air to1X 10-* g Ag/L of air in a 40-hour week. What is the allowed exposure interms of atoms of Ag/L/week?33. Determine(a) the number of atoms in 0.185 g of palladium (Pd).(b) the mass of 127 protons of palladium.34. How many protons are in(a) ten atoms of platinum?(b) ten grams of platinum?35. The isotope Si-28 has a mass of 27.977 amu. For ten grams of Si-28,н(а) Н-С—С-о(acetic acid)нО-нН(b) Н—С—СI(methyl chloride)нGive the number of protons and electrons in(a) an N; molecule (identified in 1772).(b) an N, unit (synthesized in 1890).(c) an Ng* unit (synthesized in 1999).(d) an N,N, salt (a U.S. Air Force research team's synthesis project).Give the number of protons and electrons in the following:49.50.(b) So,- ion.(d) S?- ion.(a) S, molecule.(c) H;S molecule.calculate(a) the number of atoms.(b) the total number of protons, neutrons, and electrons.Atoms, Molecules, and lons56CHAPTER TWOWrite the names of the following ionic compounds.(b) Sr(OH);64.5L Complete the table below. If necessary, use the periodic table.(c) KMNO,(a) ScCl,Number oftel Na.CO.Aumber oÉ.becafNotificationsInboxDashboardCalendarTo Do

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