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A mineral having formula AB2 cryslallises in the cubic close packed lattice ,with the A atoms occupying the lattice points.hence coordination number of A and B atoms are.?

Shriya Mehrotra , 10 Years ago
Grade 12
anser 3 Answers
Ramreddy

Last Activity: 10 Years ago

A CN=8 Cubic coordination
B CN=4 Tetrahedral coordination

AB2 type crystal structure (CaF2):
Blue – Ca
Yellow- F
227-662_CaF2_atom.gif
Co ordination number of A(For example Ca)= 8 (White one is surrounded by 8 neighbours)
Co ordination number of B(For example F)= 4 (yellow one is surrounded by 4 neighbours)
Hope you understood.227-1427_co.jpg

Shriya Mehrotra

Last Activity: 10 Years ago

thanks sir.

Kushagra Madhukar

Last Activity: 4 Years ago

Dear student,
Please find the answer to your problem.
 
Co ordination number of A(For example Ca) = 8
Co ordination number of B(For example F) = 4
Example – AB2 type crystal structure (CaF2)
 
Thanks and regards,
Kushagra

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