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एक तत्व का मोलर द्रव्यमान 2.7 × 10-2 kg mol-1 है, यह 405 pm लम्बाई की भुजा वाली घनीय एकक कोष्ठिका बनाता है। यदि उसका घनत्व 2.7 × 103 kg m-3 है तो घनीय एकक कोष्ठिका की प्रकृति क्या है ?

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= 66.430 x 6.022 x 10-2 = 4

चूँकि प्रति एकक कोष्ठिका में तत्व के 4 परमाणु उपस्थित हैं। अतः घनीय एकक कोष्ठिका फलक-केन्द्रित (fcc) अथवा घनीय निविड संकुलित (ccp) होनी चाहिए।

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