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Fill in the b...

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Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74, 26, $s p^{3} d^{2}$ , $s p^{3} d$ , chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
The percentage of unoccupied spaces in bcc and fcc arrangements are and respectively.

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Solution

The percentage of unoccupied spaces in bcc and fcc arrangements are 32 and 26 respectively.

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