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The effective radius of an iron atom is ...

The effective radius of an iron atom is `1.42 Å`. It has a rock-salt structure. Calculate its density (Fe = 56)

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The correct Answer is:
`2.16 " g cm"^(-3)`
Rock salt type structure means fcc for which ` r= a/(2sqrt2) = 0.3535 a or a = r/0.3535 or a = r/ 0.3535 = ( 142"pm")/0.3535 = 401 . 7 "pm"` For fcc , Z = 4
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