Given, Z‌‌=4,‌ for fcc lattice, ‌ M‌‌=63.54gmol−1 ‌‌=63.54×10−3kgmol−1 a‌‌=3.596Å=3.596×10−10m, NA‌‌=6.022×1023mol−1 M‌‌=63.54gmol−1 ‌‌=63.54×10−3kgmol−1, a‌‌=3.596Å=3.596×10−10m, NA‌‌=6.022×1023mol−1 On putting given values, we get ⇒‌‌d‌‌=‌