A compound is formed by two elements M and N . The element N forms CCP and atoms of M occupy 1/3 rd of tetrahedral voids. What is the formula of the compound ?


The number of N atoms in CCP (fcc) = 4 per unit cell

Number of tetrahedral voids = 2 x number of atoms

= 2 x 4

= 8

Atoms of element M occupy 1/3 rd of tetrahedral voids of tetrahedral voids, so

number of M atoms = 8 x 1/3

ratio of M and N = 8/3 : 4

= 2 : 3

formula of the compound = M2 N3


Published by Ankush Sharma

I am M.Sc (chemistry ) from Punjabi University Patiala. I am a science teacher with expertise in chemistry, with 8 years of experience in teaching. Writing and blogging is my hobby, I write whenever I am free. I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge.

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