The group and period of technetium has to be identified. Concept introduction: Periodic Table: The available chemical elements are arranged considering their atomic number, the electronic configuration and their properties. The elements placed on the left of the table are metals and non-metals are placed on right side of the table. In periodic table the horizontal rows are called periods and the vertical column are called group. There are seven periods and 18 groups present in the table and some of those groups are given special name as follows, G r o u p 1 → A l k a l i m e t a l G r o u p 2 → A l k a l i n e m e t a l G r o u p 16 → C h a l c o g e n s G r o u p 17 → H a l o g e n s G r o u p 18 → N o b l e g a s e s

BuyFind

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
BuyFind

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

Solutions

Chapter 6, Problem 83SCQ

(a)

Interpretation Introduction

Interpretation: The group and period of technetium has to be identified.

Concept introduction:

Periodic Table: The available chemical elements are arranged considering their atomic number, the electronic configuration and their properties. The elements placed on the left of the table are metals and non-metals are placed on right side of the table.

In periodic table the horizontal rows are called periods and the vertical column are called group. There are seven periods and 18 groups present in the table and some of those groups are given special name as follows,

  Group1AlkalimetalGroup2AlkalinemetalGroup16ChalcogensGroup17HalogensGroup18Noblegases

(b)

Interpretation Introduction

Interpretation: The possible set of quantum number for 5s subshell of technetium is to be determined.

Concept introduction:

Quantum numbers are numbers, which explains the existence and the behavior of electron in an atom.

  1. a) Principle quantum number is represented by n and this number describes the energy of the orbital and the size of an atom.
  2. b) Angular momentum quantum number (or azimuthal quantum number) is represented by l and this number indicates the shape of the orbitals.
  3. c) Magnetic quantum number is represented by ml and this number indicates the orientation of the orbital.
  4. d) Spin quantum number is represented by ms and this number indicates the spin of the electron.

Principle quantum number is represented by n and this number describes the energy of the orbital and the size of an atom.

The values of l when the principal quantum number is n are from 0 to (n1). Each l value indicates subshell.

The values of ml when the orbital angular quantum number is l are from l to +l.

(c)

Interpretation Introduction

Interpretation: The wavelength and frequency of the γ-ray emitted by technetium has to be calculated.

Concept introduction:

  • Planck’s equation,

    E=where, E=energyh=Planck'sconstantν=frequency

The energy increases as the wavelength of the light decrease. Also the energy increases as the frequency of the light increases.

  • The frequency of the light is inversely proportional to its wavelength.

  ν=cλwhere, c=speedoflightν=frequencyλ=wavelength

(d)

Interpretation Introduction

Interpretation:. The balanced equation of the reaction between HTcO4 and NaOH has to be determined. The mass of NaTcO4 produced and NaOH converted have to be calculated.

Concept introduction:

  • Chemical equation is the representation of a chemical reaction where the reactants and products of the reactions are represented on left and right side of an arrow respectively by using their respective chemical formulas. It follows conservation law of mass where the number of atoms of each element is equal for reactants and products.
  • The number of moles of any substance can be determined  using the equation,

  Numberofmole=GivenmassofthesubstanceMolarmass

(e)

Interpretation Introduction

Interpretation: Mass and the concentration of NaTcO4 has to be calculated if it is dissolved in 10.0mL solution.

Concept introduction:

  • Molarity (M): Molarity is number of moles of the solute present in the one liter of the solution.

  Molarity (M) =Numberofmolesofsolute1literofsolution

  • The number of moles of any substance can be determined  using the equation,

  Numberofmole=GivenmassofthesubstanceMolarmass

Want to see the full answer?

Check out a sample textbook 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!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.