An ionic compound made up of atoms 'X' a...

An ionic compound made up of atoms 'X' and 'Y' has a face centred cubic arrangement in which atoms 'X' are at the corners and atom 'Y' are at the face centres. If one of the atoms is missing from the C0rner. What is the simplest formula of the compound?

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No. of atoms of .X. at the C0rners .=7. (since .y. one atom is missing) C0ntribution of .X. tówards d C0ritibution of .Y. towards the unit cell .=6 xx 1/2=3. Ratio of X: Y=1/8: 3=7: 24 Hence formula of the compound X_2 Y_24

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