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यदि गोल्ड (परमाणु त्रिज्या = 144 pm) फलक केंद्रित घनीय एकक सेल में क्रिस्टलीकृत होता है तो इसके कोर की लम्बाई तथा दो निकटवर्ती परमाणुओं की दुरी ज्ञात कीजिए ।

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f.c.c जालक के लिए
`because` परमाणु की त्रिज्या, `r = (a)/(2 sqrt(2))`
`therefore` कोर की लम्बाई, `a = 2 sqrt(2).r=2xxsqrt(2)xx144 = 407` pm
निकटवर्ती परमाणुओं की दुरी `(d) = (a)/(sqrt(2))=(407)/(sqrt(2)) = 287.8` pm
या `d = 2r = 2 xx 144 = 288` pm

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