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문제 55b
Write isotopic symbols in the form AZX for each isotope. b. the iron isotope with 30 neutrons
문제 55c
Write isotopic symbols in the form AZX for each isotope. c. the rubidium isotope with 45 neutrons
문제 57a
Determine the number of protons and the number of neutrons in each isotope. a. 147N
문제 57d
Determine the number of protons and the number of neutrons in each isotope. d. 20882Pb
문제 58
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.
문제 59
문제 61
Determine the number of protons and the number of electrons in each ion. a. Ni2+ b. S2– c. Br– d. Cr3+
문제 62b
Determine the number of protons and the number of electrons in each ion. b. Se2-
문제 62c
Determine the number of protons and the number of electrons in each ion. c. Ga3+
문제 62d
Determine the number of protons and the number of electrons in each ion. d. Sr2+
문제 64a
Predict the charge of the ion formed by each element. a. Sr
문제 64c
Predict the charge of the ion formed by each element. c. I
문제 66
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
문제 70
Write the symbol for each element and classify it as a metal, nonmetal, or metalloid. a. bromine b. potassium c. lead d. silicon e. silver
문제 71
Determine whether or not each element is a main-group element. a. tellurium b. potassium c. vanadium d. manganese
문제 72
Determine whether or not each element is a transition element. a. Cr b. Br c. Mo d. Cs
문제 74
Classify each element as an alkali metal, alkaline earth metal, halogen, or noble gas. a. F b. Sr c. K d. Ne e. At
문제 76
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?
문제 79
문제 81
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.
문제 82
문제 83
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.
문제 84
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
문제 85b
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.
문제 86
Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The mass and natural abundance of Si-28 are 27.9769 amu and 92.2%, respectively. The mass and natural abundance of Si-29 are 28.9765 amu and 4.67%, respectively. Find the mass and natural abundance of Si-30.
문제 87
Use the mass spectrum of europium to determine the atomic mass of europium.
문제 88
Use the mass spectrum of rubidium to determine the atomic mass of rubidium.
문제 91
How many sulfur atoms are there in 5.52 mol of sulfur?
문제 92
A gold sample contains 4.65×1024 gold atoms. How many moles of gold does the sample contain?
문제 93c
What is the amount, in moles, of each elemental sample? a. 23.2 g Kr
