Winters there be really cold sometimes A. could B. may C. might D. can

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

An electrons position cannot be known precisely only it's probability of being in a certain location can be known