MgO has the same structure as NaCl. If the radii of O2- and Mg2 ions are 0.14 nm and 0.07 nm, respectively, determine (a) the packing factor and (b) the density of the material. The atomic weight of O is 16.0 g/mol and that of Mg is 24.3 g/mol.

odds are decent that your handwriting right now looks a little bit different than it did five years ago, and will look different again in five more. when i look back through my notebooks from middle school to now, i see a long, slow progression from meticulous and teeny letters to bigger, sloppier ones, plus a few side detours: sometime in high school, for example, i decided those loopy cursive lowercase f’s were just the coolest, adopting them as the lone rep for cursive in my otherwise all-print handwriting.

explanation:

nuhygjhuhuouh9oygyuhuh8h9guig97uogh8uog978o0rfyhkmkv h