Which answer choice describes the noble gases A. all of the elements of group 18 in the orange boxes
B. all the elements of the period one in orange boxes
C. the two separate rows of elements in the dark and light blue boxes at the bottom
D. all of the elements in the green boxes​

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.