Q.Make groups and each group prepares a powerpoint presentation on properties and applications of one element. You can use your imagination to create some innovative ways of presenting data. You can use pictures, images, flow charts, etc. to make the presentation easier to understand. Don't forget to cite the reference(s) from where data for presentation is collected (including figures and charts). Have fun!

Interstitial compounds are metal lattices with small non-metal atoms trapped in the gaps; alloys are classified by how the second component is incorporated and by whether iron is present.

Interstitial compounds: compounds formed when small atoms such as hydrogen, carbon, nitrogen, or boron become trapped in the interstitial voids/spaces of a transition metal's crystal lattice, without disrupting the parent metallic structure. They typically retain metallic conductivity/lustre, are very hard, chemically inert, and have high melting points. Examples: $TiC$, $Fe_3N$, $Mn_4N$, $VH_{0.56}$, $TiH_{1.7}$ (used in steel-making and as hard, refractory materials).

Classification of alloys:

1. Homogeneous alloys (solid solutions):
   • Substitutional alloys — atoms of similar size replace host metal atoms in the lattice, e.g. brass (Cu–Zn), bronze (Cu–Sn).
   • Interstitial alloys — small atoms occupy the interstitial voids of the host metal lattice, e.g. steel (Fe with interstitial C). …