Argentina
Australia
Brazil
Chile
Colombia
Liechtenstein
Madagascar
Slovenia
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Answer - They all have internet top-level domains that are Chemical symbols.Argentina - AR (Argon)
Australia - AU (Gold)
Brazil - BR (Bromine)
Chile - CL (Chlorine)
Colombia - CO (Cobalt)
Liechtenstein - LI (Lithium)
Madagascar - MG (Magnesium)
Slovenia - SI (Silicon)