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Ionic Compounds and Radius Ratios

If a cube has...

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If a cube has edge length 'a' then at what minimum distance will the atoms placed at the corners touch each other?

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Q. Polonium adopts a cubic structure with an edge length of the cube being

0.336 n m

. The distance between the polonium atoms which lie at the corners along the body diagonal is:

Q. A solid has a structure in which X atoms are located at cubic corners of a unit cell, O atoms are at the edge centres and Y atoms at cube centre. Then the formula of a compound is

X_{a} Y_{b} O_{c}

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X_{x} Y_{y} O_{z}

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(x + y + z) - (a + b + c)

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W

' atoms are located at the corners of a cubic lattice '

O

' atom at the center of the edge and

N a

atoms at the center of the cube. The formula for the compound is:

C s C l

crystallizes in a cubic lattice that has a

C l^{-}

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C s^{+}

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(r_{C s^{+}}) = 1.69 o A

(r_{C l^{-}}) = 1.81 o A

, what is the value of edge length a of the cube?

Q. A solid has a structure in which W atoms are located at the corners of edges, O atoms are at the center of face edges and Na atom at the center of the cube. The formula of the compound is:

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