1.

Gold (at. Mass 197 g mol^(-1))crystallises in cubic closest packed structures (the face-crntred cubic) and has a density of 19.3 g//cm^(3) . Atomic radius is

Answer»

`144.17` pm
`407.8` pm
`128.32` pm
`203.4` pm

SOLUTION :DENSITY `d=(MZ)/(a^(3)N_(A))"":.a^(3)=(MxxZ)/(N_(A)xxd)`
`a=3sqrt((197xx4)/(6.023xx10^(23)xx19.3))`
`a=407.8xx10^(-10)cm=407.8` pm
`r=(407.8)/(SQRT(8))=144.18`pm


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