Calculate the ionic characterisation value for two elements with electronegativity of 0.7 and 3.98. Enter your answer as a percentage with 2 decimal places. Answer:

the answer should be equal to 0.842

When a cold-worked metal is heat-treated below its melting point over a period of time, which of the following phenomena occur? (This question has more than one correct answer) a. Strength is increased b. Dislocation density decreases c. Grain size increases d. Internal lattice strains decrease e. Ductility is reduced

What is cold working process for metals? Why cold working can help improve strength of the metal? Use dislocation theory to explain.

Sodium chloride (NaCl) has the rock salt crystal structure and a density of 2.17 g/cm³. The atomic weights of sodium and chlorine are 22.99 g/mol and 35.45 g/mol, respectively. (a) Determine the unit cell edge length. nm (b) Determine the unit cell edge length from the radii in the table below assuming that the Nat and Cl- ions just touch each other along the edges. nm Cation Mg2+ Fe2+ Na+ Ionic Radius (nm) 0.072 0.077 0.102 Anion Ionic Radius (nm) CI- 0²- 0.181 0.140

You are given the density of a metal as 2.07 g/cm³. You are advised the crystallographic structure is fcc, and the atomic mass is 25.5 g/mol. What is the atomic radius of the metal? a. 0.15 nm b. 0.12 nm c. 0.11 nm d. 0.18 nm

do not provide wrong solution

Show that Ni and Cu are totally soluble in one another using Hume-Rothery rules. Atomic radii, electronegativities and crystal structures of Ni and Cu are given below. Ni Cu Crystal Structure FCC FCC Electronegativities 1.9 1.8 r (nm) 0.1246 0.1278

Write down the Miller-Bravais index of the a-plane of the HCP Zn pure metal and draw the atomic arrangement of the a-plane cross-section with reference to the FCC example below.

1. Is there a difference in packing (coordination number) between these two types (FCC and HCP) of structures?   2. Look at the two structures. A small difference in arrangement of atoms causes a dramatic difference in the properties of FCC ductile metals and HCP brittle metals. Can you see it? Try to draw the differences (You can draw the 3-layers separately):