Crystals

How many fundamental regions are there in one face of a speck of salt? (With a ruler, we can estimate that face is a square that is $0.1$ cm on a side.)

Give the locations of the atoms in the diamond cube both in terms of the basis, and in Ångstroms.

This illustrates how we could compute the dimensions of a unit cell from the shape in which a substance crystallizes (, p. 462).

• Recall that there are $6.022\times 10^{23}$ atoms in a mole (this is Avogadro’s number). From that, and the fact that platinum has a mass of $195.08$ grams per mole, calculate the mass of each atom.

• Platinum crystallizes in a face-centered cubic lattice with atoms at each lattice point, that i…