At room temperature, sodium crystallized in a body`-`centred cubic lattrice with `a=4.24Å`. Calculate theoretical density of sodium `(` at wt. of`Na =23)`.
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`:'`Total no. of atoms `(z)` per unit cell ltbr. `=8xx(1)/(8)+1=2` Density `rho=(zxxat.wt.)/(Av. no . xxa^(3))` `=(2xx23)/(6.023xx10^(23)xx(4.24xx10^(-8))^(3))` ~~1.0g cm^(-3)`
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