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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:
`5.74 "g cm"^(-3)`
Rock salt type structure means fcc for which `r=a/(2sqrt2)`=0.3535 a or `a=r/0.3535="142pm"/0.3535`=401.7 pm
For fcc, Z=4
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