close solutoin list

The radioactive element technetium is not found naturally on Earth; it must be synthesized in the laboratory. It is a valuable element, however, because it has medical uses. For example, the element in the form of sodium pertechnetate (NaTcO 4 ) is used in imaging studies of the brain, thyroid, and salivary glands and in renal blood flow studies, among other things. (a) In what group and period of the periodic table is the element found? (b) The valence electrons of technetium are found in the 5 s and 4 d subshells. What is a set of quantum numbers ( n , l , and m l ) for one of the electrons of the 5 s subshell? (c) Technetium emits a y-ray with an energy of 0.141 MeV. (1 MeV = 10 6 electron-volts, where 1 eV = 1.6022 × 10 −19 J.) What are the wave- length and frequency of a γ-ray photon with an energy of 0.141 MeV? (d) To make NaTc0 4 , the metal is dissolved in nitric acid. 7 HNO 3 (aq) + Tc(s) → HTcO 4 (aq) + 7 NO 2 (g) + 3 H 2 O( l ) and the product, HTcO 4 , is treated with NaOH to make NaTcO 4 . (i) Write a balanced equation for the reaction of HTcO 4 with NaOH. (ii) If you begin with 4.5 mg of Tc metal, what mass of NaTcO 4 can be made? What mass of NaOH, in grams, is required to convert all of the HTcO 4 into NaTcO 4 ? (e) If you synthesize 1.5 micromoles of NaTcO 4 , what mass of compound do you have? If the compound is dissolved in 10.0 mL of solution, what is the concentration?s

BuyFind

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074
BuyFind

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074

Solutions

Chapter
Section
Chapter 6, Problem 83SCQ
Textbook Problem

The radioactive element technetium is not found naturally on Earth; it must be synthesized in the laboratory. It is a valuable element, however, because it has medical uses. For example, the element in the form of sodium pertechnetate (NaTcO4) is used in imaging studies of the brain, thyroid, and salivary glands and in renal blood flow studies, among other things.

  1. (a) In what group and period of the periodic table is the element found?
  2. (b) The valence electrons of technetium are found in the 5s and 4d subshells. What is a set of quantum numbers (n, l, and ml) for one of the electrons of the 5s subshell?
  3. (c) Technetium emits a y-ray with an energy of 0.141 MeV. (1 MeV = 106 electron-volts, where 1 eV = 1.6022 × 10−19 J.) What are the wave- length and frequency of a γ-ray photon with an energy of 0.141 MeV?
  4. (d) To make NaTc04, the metal is dissolved in nitric acid.

    7 HNO3(aq) + Tc(s) → HTcO4(aq) + 7 NO2(g) + 3 H2O(l)

    and the product, HTcO4, is treated with NaOH to make NaTcO4.

    1. (i) Write a balanced equation for the reaction of HTcO4 with NaOH.
    2. (ii) If you begin with 4.5 mg of Tc metal, what mass of NaTcO4 can be made? What mass of NaOH, in grams, is required to convert all of the HTcO4 into NaTcO4?
  5. (e) If you synthesize 1.5 micromoles of NaTcO4, what mass of compound do you have? If the compound is dissolved in 10.0 mL of solution, what is the concentration?s

Expert Solution

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

See Solution

*Response times vary by subject and question complexity. Median response time is 34 minutes and may be longer for new subjects.

Chapter 6 Solutions

Chemistry & Chemical Reactivity
Show fewer chapter solutions
Ch. 6.1 - (a) Which color in the visible spectrum has the...Ch. 6.2 - Calculate the energy per mole of photons for the...Ch. 6.3 - Calculate the energy of the n = 3 state of the H...Ch. 6.3 - The Lyman series of spectral lines for the H atom,...Ch. 6.4 - Calculate the wavelength associated with a neutron...Ch. 6.7 - Which has the longer wavelength, visible light or...Ch. 6.7 - Calculate the energy per mole of photons (in...Ch. 6.7 - The main lines in the emission spectrum of sodium...Ch. 6.7 - Does the main emission line for SrCl2 have a...Ch. 6.7 - Mg is oxidized by KCIO4, to make white flashes....Ch. 6.7 - Helium absorbs light at 587.6 nm. What is the...Ch. 6.7 - Iron atoms absorb light at a frequency of 5.688 ×...Ch. 6.7 - Sodium atoms are responsible for a closely spaced...Ch. 6.7 - Hydrogen has an absorption line at 434.1 nm. What...Ch. 6.7 - What are the final and initial electronic states...Ch. 6 - Answer the following questions based on Figure...Ch. 6 - Consider the colors of the visible spectrum. (a)...Ch. 6 - Traffic signals are often now made of LEDs...Ch. 6 - Suppose you are standing 225 m from a radio...Ch. 6 - Green light has a wavelength of 5.0 102 nm. What...Ch. 6 - Violet light has wavelength of about 410 nm. What...Ch. 6 - The most prominent line in the emission spectrum...Ch. 6 - The most prominent line in the emission spectrum...Ch. 6 - Place the following types of radiation in order of...Ch. 6 - Place the following types of radiation in order of...Ch. 6 - An energy of 3.3 1019 J/atom is required to cause...Ch. 6 - You are an engineer designing a switch that works...Ch. 6 - The most prominent line in the spectrum of mercury...Ch. 6 - The most prominent line in the spectrum of neon is...Ch. 6 - A line in the Balmer series of emission lines of...Ch. 6 - What are the wavelength and frequency of the...Ch. 6 - Consider only transitions involving the n = 1...Ch. 6 - Consider only transitions involving the n = 1...Ch. 6 - The energy emitted when an electron moves from a...Ch. 6 - If energy is absorbed by a hydrogen atom in its...Ch. 6 - Calculate the wavelength and frequency of light...Ch. 6 - Calculate the wavelength and frequency of light...Ch. 6 - An electron moves with a velocity of 2.5 X 108...Ch. 6 - A beam of electrons (m = 9.11 X 1031 kg/electron)...Ch. 6 - Calculate the wavelength, in nanometers,...Ch. 6 - A rifle bullet (mass = 1.50 g) has a velocity of...Ch. 6 - (a) When n = 4, what are the possible values of ?...Ch. 6 - (a) When n = 4, = 2, and m = 1, to what orbital...Ch. 6 - A possible excited state of the H atom has the...Ch. 6 - A possible excited state for the H atom has an...Ch. 6 - How many subshells occur in the electron shell...Ch. 6 - How many subshells occur in the electron shell...Ch. 6 - Explain briefly why each of the following is not a...Ch. 6 - Which of the following represent valid sets of...Ch. 6 - What is the maximum number of orbitals that can be...Ch. 6 - What is the maximum number of orbitals that can be...Ch. 6 - Explain briefly why each of the following is not a...Ch. 6 - Explain briefly why each of the following is not a...Ch. 6 - State which of the following orbitals cannot exist...Ch. 6 - State which of the following orbitals cannot exist...Ch. 6 - Write a complete set of quantum numbers (n, , m)...Ch. 6 - Write a complete set of quantum numbers (n, , and...Ch. 6 - A particular orbital has n = 4 and = 2. What must...Ch. 6 - A given orbital has a magnetic quantum number of m...Ch. 6 - How many nodal surfaces through the nucleus...Ch. 6 - How many nodal surfaces through the nucleus...Ch. 6 - Which of the following are applicable when...Ch. 6 - In what region of the electromagnetic spectrum for...Ch. 6 - Give the number of nodal surfaces through the...Ch. 6 - What is the maximum number of s orbitals found in...Ch. 6 - Match the values of l shown in the table with...Ch. 6 - Sketch a picture of the 90% boundary surface of an...Ch. 6 - Complete the following table.Ch. 6 - Excited H atoms have many emission lines. One...Ch. 6 - An advertising sign gives off red light and green...Ch. 6 - Radiation in the ultraviolet region of the...Ch. 6 - A cell phone sends signals at about 850 MHz (where...Ch. 6 - Assume your eyes receive a signal consisting of...Ch. 6 - If sufficient energy is absorbed by an atom, an...Ch. 6 - Suppose hydrogen atoms absorb energy so that...Ch. 6 - Rank the following orbitals in the H atom in order...Ch. 6 - How many orbitals correspond to each of the...Ch. 6 - Cobalt-60 is a radioactive isotope used in...Ch. 6 - Exposure to high doses of microwaves can cause...Ch. 6 - When the Sojourner spacecraft landed on Mars in...Ch. 6 - The most prominent line in the emission spectrum...Ch. 6 - Answer the following questions as a summary quiz...Ch. 6 - Answer the following questions as a summary quiz...Ch. 6 - For an electron in a hydrogen atom, calculate the...Ch. 6 - A solution of KMnO4 absorbs light at 540 nm (page...Ch. 6 - A large pickle is attached to two electrodes,...Ch. 6 - The spectrum shown here is for aspirin. The...Ch. 6 - The infrared spectrum for methanol. CH3OH, is...Ch. 6 - Bohr pictured the electrons of the atom as being...Ch. 6 - Light is given off by a sodium- or...Ch. 6 - How do we interpret the physical meaning of the...Ch. 6 - What does wave-particle duality mean? What are its...Ch. 6 - In principle, which of the following can he...Ch. 6 - Suppose you live in a different universe where a...Ch. 6 - A photon with a wavelength of 93.8 nm strikes a...Ch. 6 - Explain why you could or could not measure the...Ch. 6 - The radioactive element technetium is not found...

Additional Science Textbook Solutions

Find more solutions based on key concepts
Show solutions
Your daughter is leaving for college in the fall. Recently, there has been disturbing news about the excessive ...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

Describe how bone first develops.

Human Biology (MindTap Course List)

What does the word apparent mean in apparent visual magnitude?

Horizons: Exploring the Universe (MindTap Course List)

A square plate of copper with 50.0-cm sides has no net charge and is placed in a region of uniform electric fie...

Physics for Scientists and Engineers, Technology Update (No access codes included)