An Ionic Crystalline Solid,MX₂,has a Cubic Unit Cell

question 10

Multiple Choice

An ionic crystalline solid,MX₂,has a cubic unit cell.Which of the following arrangements of the ions is consistent with the stoichiometry of the compound?

• A)M²⁺ ions at the corners and at each face,8 X^- ions at the tetrahedral centers
• B)M²⁺ ions at each face,X^- ions at the corners
• C)M²⁺ ions at the corners,X^- ions at the faces,and 2 X^- ions at the tetrahedralcenters
• D)4 M²⁺ ions at the body centers,X^- ions at the corners and at the faces
• E)M²⁺ ions at the corners and at the faces,4 X^- ions at the octahedral centers

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