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एक धात्विक तत्व अन्त:केन्द्रित घनीय (bcc) जालक के रूप में पाया जाता है। एकक कोष्ठिका की प्रत्येक कोर की लम्बाई 288 pm है। धातु का घनत्व 7.2 g cm है। धातु के 100 में कितने परमाणु तथा एकक कोष्ठिकाएं होंगी? 

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 bce जालक के लिए,

Z = 2,a  = 288 pm

= 288 x 10-10 cm

d = 7.2 g cm-3 , M = 100 g

NA = ?

bce जालक के लिए,

= 5.814 x 1023

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