Chemistry
The chemical(s) most commonly used for cloud seeding or ‘artificial rainmaking’ is/are

Sodium Chloride
Silver Iodide
All listed here
Dry ice or frozen carbon dioxide

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Chemistry
The lustre of the metals is because of

High polish
Reflection of light due to the presence of free electrons
Absorption of light due to the presence of cavities
High density, due to closed packing of atoms

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