The ionic radii of Mg²⁺ and O^2- are 86 pm and 126 pm, respectively. the edge length of the unit cell of MgO will be

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350 pm

212 pm

424 pm

521 pm

answer is C.

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Detailed Solution

For MgO, r_c/r_a = 86 pm/126 pm= 0.682. It is more than 0.414 but less than 0.732. Thus MgO occurs as rock-salt structure. The edge length unit cell is 2(r_a+r_c)= 2 (86 + 126) pm= 424 pm

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