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Niobium crystallises in body centred cub...

Niobium crystallises in body centred cubic structure. Its density is 8.55g `cm^3` atomic mass is `93g "mol"^(-1)(N_A = 6.023 xx 10^(23))`
What is the atomic radius of Niobium?

A

`136` pm

B

`140` pm

C

`143` pm

D

`149` pm

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