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Problem 52c
Write isotopic symbols in the form AZX for each isotope. c. the potassium isotope with 21 neutrons
Problem 53a
Determine the number of protons and the number of neutrons in each isotope. a. 147N
Problem 53d
Determine the number of protons and the number of neutrons in each isotope. d. 20882Pb
Problem 54
Determine the number of protons and the number of neutrons in each isotope. a. 4019K b. 22688Ra c. 9943Tc d. 3315P
- Determine the number of protons and the number of neutrons in carbon-14 and write its symbol in the form AZX, considering that the amount of carbon-14 in ancient artifacts and fossils is often used to establish their age.
Problem 55
- Determine the number of protons and neutrons in uranium-235, which is used in nuclear fission, and write its symbol in the form AZX.
Problem 56
Problem 57
Determine the number of protons and the number of electrons in each ion. a. Ni2+ b. S2– c. Br– d. Cr3+
Problem 58b
Determine the number of protons and the number of electrons in each ion. b. Se2-
Problem 58c
Determine the number of protons and the number of electrons in each ion. c. Ga3+
Problem 58d
Determine the number of protons and the number of electrons in each ion. d. Sr2+
Problem 59
Predict the charge of the ion formed by each element. a. O b. K c. Al d. Rb
Problem 60a,b,d
Predict the charge of the ion formed by each element. a. Mg b. N d. Na
Problem 60c
Predict the charge of the ion formed by each element. c. F
Problem 61
Fill in the blanks to complete the table. Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion Ca Ca2+ ______ ______ ______ Be2+ 2 ______ Se ______ ______ 34 In ______ ______ 49
Problem 62
Fill in the blanks to complete the table.
Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion
Cl ______ ______ 17
Te ______ 54 ______
Br Br– ______ ______
______ Sr2+ ______ 38
- Write the name of each element and classify it as a metal, non-metal, or metalloid. a. K b. Ba c. I d. O e. Sb
Problem 63
Problem 64
Write the symbol for each element and classify it as a metal, nonmetal, or metalloid. a. gold b. fluorine c. sodium d. tin e. argon
Problem 65
Determine whether or not each element is a main-group element. a. tellurium b. potassium c. vanadium d. manganese
Problem 66
Determine whether or not each element is a transition element. a. Cr b. Br c. Mo d. Cs
Problem 67
Classify each element as an alkali metal, alkaline earth metal, halogen, or noble gas. a. sodium b. iodine c. calcium d. barium e. krypton
Problem 68
Classify each element as an alkali metal, alkaline earth metal, halogen, or noble gas. a. F b. Sr c. K d. Ne e. At
Problem 69
Which pair of elements do you expect to be most similar? Why? a. N and Ni b. Mo and Sn c. Na and Mg d. Cl and F e. Si and P
Problem 70
Which pair of elements do you expect to be most similar? Why? a. nitrogen and oxygen b. titanium and gallium c. lithium and sodium d. germanium and arsenic e. argon and bromine
- How would you sketch the mass spectrum of gallium given its two naturally occurring isotopes with the following masses and natural abundances: Isotope Mass (amu) Abundance (%) Ga-69 68.92558 60.108 Ga-71 70.92470 39.892?
Problem 71
- Sketch the mass spectrum of magnesium given its three naturally occurring isotopes with the following masses and natural abundances: Isotope Mass (amu) Abundance (%) - Mg-24: 23.9850, 78.99% - Mg-25: 24.9858, 10.00% - Mg-26: 25.9826, 11.01%.
Problem 72
Problem 73
The atomic mass of fluorine is 18.998 amu, and its mass spectrum shows a large peak at this mass. The atomic mass of chlorine is 35.45 amu, yet the mass spectrum of chlorine does not show a peak at this mass. Explain the difference.
- The atomic mass of copper is 63.546 amu. Do any copper isotopes have an exact mass of 63.546 amu? Explain.
Problem 74
Problem 75
An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4%, and isotope 2 has a mass of 122.9042 amu. Find the atomic mass of this element and identify it.
Problem 76
An element has four naturally occurring isotopes with the masses and natural abundances given here. Find the atomic mass of the element and identify it.
Isotope Mass (amu) Abundance (%)
1 135.90714 0.19
2 137.90599 0.25
3 139.90543 88.43
4 141.90924 11.13
Problem 77b
Bromine has two naturally occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu. The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%. Calculate the mass and natural abundance of Br-79.
