Classify each statement as true or false. If there is an atom present at the corner of a unit cell, there must be the same type of atom at all corners of the unit cell. If one face of a unit cell has an atom in its center, then the face opposite that face must also have an atom at its center. If one face of a unit cell has an atom in its center, all the faces of the unit cell must also have atoms at their centers. A unit cell must be defined so that there are atoms at the corners.

If the density of europium is 5.25 g/cm3 at 20 degrees celsius with a volume of 1.52 x 10-22cm3, what is the mass (in grams)of one unit cell?

Metallic uranium crystallizes in a body-centered cubic lattice, with one U atom per lattice point. If the metallic radius of U is 148.5 pm, what is the volume of the unit cell?

Solid NaF has the so-called NaCl structure. The shortest distance between the centre of a sodium cation and the centre of a fluoride anion is 231.5 pm. Calculate the length of the edge of the conventional face-centred cubic unit cell of NaF. Calculate the density of solid NaF. Calculate the shortest distance (centre to centre) between two fluoride anions in solid NaF.

9. A binary ionic compound crystallizes in the cubic unit cell shown below. The anions (larger spheres) define the unit cell while four cations (smaller dark spheres) are located in tetrahedral holes within the unit cell. What is the formula for this ionic compound (M = cation, X= anion)? eelo bi biloa bifoa oino biloe ci le of hsk at s sta P. MX b. M2X MX2 d. M2X3 e. MX4 a. с. D. 10. The cubic uniț çell of rhenium trioxide (ReOa) hoo Po

What is the simplest formula of a solid containing A, B, C atoms in a cubic lattice in which A atoms occupy the corners, the B atom is the body-centered position, and the C atoms the faces of the unit cell?