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एक तत्व काय केंद्रित घनीय (bcc) संरचना में 200 pm कोर (edge) लम्बाई के साथ क्रिस्टलीकृत होता है । यदि इकाई सेल का घनत्व 10 ग्राम `"सेमी"^(-3)` हो तो 200 ग्राम में कितने परमाणु होंगे ?

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`because` इकाई सेल का घनत्व `(rho) = (Z xx M)/(a^(3) xx N_(A))`
bcc के लिए Z = 2, a = 200 pm `= 2 xx 10^(-8)` cm
`therefore" "M=(10 xx (2 xx 10^(-8))^(3) xx 6.023 xx 10^(23))/(2) = "24.09 g mol"^(-1)`
`because` तत्व के 24.09 ग्राम में उपस्थित है `= 6.023 xx 10^(23)` परमाणु
`therefore` तत्व के 200 ग्राम में उपस्थित होंगे `= (6.023 xx 10^(23)xx200)/(24.09) = 5.0 xx 10^(24)` परमाणु

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