How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.

Let ‘a’ be the edge length of a cubic unit cell and it contains ‘Z’ atoms of a substance of atomic mass ‘M’.

From the above expression for density, d we can calculate the atomic mass, M of metal as other parameters are known.

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What is the coordination number of each type of ions in a rock-salt type crystal structure?

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Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous:

(i) Tetra phosphorous decoxide (P₄O₁₀)

(ii) Ammonium phosphate (NH₄)₃PO₄

(iii) SiC

(iv) I₂

(v) P₄

(vi) Plastic

(vii) Graphite

(viii) Brass

(ix) Rb

(x) LiBr

(xi) Si

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Define the term ‘amorphous’. Give a few examples of amorphous solids.

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Why is potassium chloride sometimes violet instead of pure white.

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What type of substances exhibits anti-ferromagnetism?

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What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass?

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What is meant by the term ‘coordination number’?

(ii) What is the coordination number of atoms:

(a) in a cubic close-packed structure?

(b) in a body-centred cubic structure?

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What is the co-ordination number of atoms:
(i) in a cubic close packed structure?
(ii) in a body centred cubic structure?

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What is the total number of atoms per unit cell in a face-centred cubic (fcc) structure?

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The Solid State