Question

Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(increases, decreases, positive, efficient, 68, non-efficient, no $\alpha$-hydrogen, $\alpha$-hydrogen, negative, Rosenmund's, greater, Cannizzaro, 74, common-ion effect, lesser, buffer action, diamagnetic, paramagnetic)
Both $ccp$ and $hcp$ are _______ packings and occupy about _______% of the available space.

Answer 1

Both ccp and hcp are efficient packing and occupy about $74$% of the available space. ccp is also known as fcc. Among the given unit cells, the packing efficiency is maximum for ccp and hcp.