Inorganic Chemistry Answers

Thallium bromide (TlBr) has a cesium chloride (CsCl) crystal structure.
i. Draw a unit cell of TlBr and determine the coordination number of Tl+ and Br- ions.
ii.Determine in which cubic form the TlBr occurs.
iii.Calculate the total number of ions in the cell unit.
iv. It is true that the edge length (a) of this crystal lattice is 2.31 times the radius (r) of the ions in the crystal? Justify your answer.
v. If the crystal has edge length (a) of 36.5 cm, calculate density of the crystal.

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The highest energy electrons in an atom Q have the principal quantum number n = 4 and the angular quantum number l = 0. What is the maximum number of electrons present in atom Q?

What are the similarities and the difference between:
i. a 1s orbitals and a 3s orbitals
ii. a 2px orbitals and 2pz orbitals

An atom X contains eight electrons in s orbitals, twelve electron in p orbitals, and eight electrons in d orbitals. Write the electronic configuration of X and determine what is atom X?

3. Quantum numbers describe the energy level of an orbital and define the shape and orientation of the region in space where the electron is most likely to be found.
(a) What are the similarities and the difference between:
i. a 1s orbitals and a 3s orbitals
ii. a 2px orbitals and 2pz orbitals
(b) The highest energy electrons in an atom Q have the principal quantum number n = 4 and the angular quantum number l = 0. What is the maximum number of electrons present in atom Q?

A cubic solid is made of two elements P and Q. All P cations are located at the corners of the unit cell and six Q anions on the center of all the cubic faces.
i. Draw a structure of the cubic mentioned above.
ii. What is the coordination number of Q?
iii. What is the formula of the compound? Show your work.

Solid materials can be classified into three different categories named crystalline, polycrystalline and amorphous. Advance studies in material chemistry lead to development of technology and innovation.
(a) Define the factors that should be taken into consideration when innovating new materials.
(b) What makes crystal is different from amorphous material? Give one example for each type of materials.

3. Quantum numbers describe the energy level of an orbital and define the shape and orientation of the region in space where the electron is most likely to be found.
(a) What are the similarities and the difference between:
i. a 1s orbitals and a 3s orbitals
ii. a 2px orbitals and 2pz orbitals
(b) The highest energy electrons in an atom Q have the principal quantum number n = 4 and the angular quantum number l = 0. What is the maximum number of electrons present in atom Q?
(c) An atom X contains eight electrons in s orbitals, twelve electron in p orbitals, and eight electrons in d orbitals. Write the electronic configuration of X and determine what is atom X?

Miller indices form a notation system in crystallography for planes in crystal (Bravais) lattices. In particular, a family of lattice planes is determined by three integers.
a) Draw the following planes of Miller Indices in the given cubic lattice.
i. (0 1 1)
ii. (1 3 2)
iii. (1 0 2)
iv. (0 2 1)
v. (2 0 2)
(d) Zinc sulphide (ZnS) has two common polymorphs which is sphalerite and wurtzite.
i. Diffrentiate the arrangement of ions in the sphalerite and wurtzite structure.
ii. By using your own illustration, briefly explain two most common atom orientations that generate close-packed lattice.