(a) Depending on temperature, a hypothetical ionic sold MX can exst as ether the

Question

(a) Depending on temperature, a hypothetical ionic sold MX can exst as ether the rock- salt or caesium-chlonde structure 0 Draw the lattice structure of MX as the rock-salt arrangement ()Draw the lattice structure of MX as the caesium-chlonde arrangement ) Conhrm the stoichiometry of each is consistent with the structure (v) If the ideal radius ratio for the rock salt structure is0414 and for caesium-chlonde 0 732, in which of these structures will M have the larger apparent radius? (15) 1 (b) Dehne what is meant by the coordinaton number of a crystal structure Illustrate your answer with an example 1 (c) Give the coordnation number for each of the followng crystal structures Rock salt (NaC) )Caesum-chlonde (CsCI) ) Zinc-blende (nS) (v) Ruble (TO.

Explanation / Answer

1) b ) total number of atom which is surrkundes by central atom called cordination number.

Ex. For SIMPLE CUBIC coordination 6. ( If you pick up any atom from the group of lattice you will find that any atom can make bond with maximum 6 atom).

C) 1 ~ 6

2~ 8

3~ 4

4~ ( 6,3) both are the cordination number of rutile

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