Use this "best-fit" straight line to predict the density of seaborgium (assuming that Sg has the same crystal packing arrangement as the other three elements). Using a ruler or straightedge, draw a "best-fit" straight line through the data points. The percentage of the total space which is occupied by the particles in a certain packing is known as packing efficiency. Packing fraction Total volume of unitcelltotal volume occupied by atoms a 34× 34r 3 Also 2a4ra2 2r P.F ccp (2 2r) 34× 34r 3 3×16 216 3 2 0. Each of the four packing arrangements has a different amount of filled space: \( \begin \) on the \( x \)-axis versus the average density of each element (determinedīy you) on the \( y \)-axis. So in a bulk solid, there are empty spaces that contain no mass (these spaces are smaller than the atoms around them) - the result is the density of a bulk solid sample is less than the atomic density of the atoms making up the solid. ![]() As you consider the various packing structures, note the empty space between the atoms. ![]() As described earlier, bulk samples of metals (and other monatomic solids) form lattices that contain one of four repeating patterns (unit cells)-simple cubic (SC), body-centered cubic (BCC), hexagonal closestpacked (HCP), and cubic closest-packed (CCP) (Figure 6).
0 Comments
Leave a Reply. |