Strontium Oxide Has a Face-Centered Cubic Unit Cell of Oxide

question 4

Multiple Choice

Strontium oxide has a face-centered cubic unit cell of oxide ions with the strontium in octahedral holes.If the radius of Sr²⁺ is 127 pm and the density of SrO is 4.7 g/cm³,what is the radius of the oxide ion? (100 cm = 1 × 10¹² pm)

• A) 176 pm
• B) 132 pm
• C) 127 pm
• D) 137 pm
• E) 273 pm

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