The telluride ion is Te²⁻. It is the final stable member of the series of dianions O²⁻, S²⁻, and Se²⁻ (see chalcogenide).

Tellurides also describe a class of compounds formally derived from Te²⁻; i.e., their electronic structure is reasonably well approximated by considering the tellurium atom as having an octet configuration. Using this approach, Ag₂Te is derived from Ag⁺.

Examples:

• hydrogen telluride, H₂Te
• sodium telluride, Na₂Te

See category for a list.

Discussion

In aqueous solution, Te²⁻ exists only at high pH. In neutral conditions, hydrogen telluride ion, HTe⁻, is prevalent. In acid conditions, hydrogen telluride, H₂Te, forms. Products of three reaction products with tellurium have economic importance: cadmium, bismuth and lead. Cadmium telluride has photovoltaic acitivity, while bismuth and lead tellurides are exceptional thermoelectric materials.

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