Fill in the blanks choosing appropriate word/ words from those given in the brackets : (gravity separation, magnetic separation, absence, presence, `CuFeS_2`, `Cu_2S`, froth flotation, aluminium, iron, smelting, pure, impure, mines, copper, silver, sulfide, zinc, chromium nickel, tin, blister copper, Cus, Fes, thermal, electrical, argentite or silver glance `(Ag_2S)`, cuprous oxide, cuprous sulfide.)
Copper is used in radiators because of its good ......... conductivity.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for a word or words to fill in the blank in the sentence: "Copper is used in radiators because of its good ________ conductivity."

2. **Identifying the Context:**
The context is about the properties of copper that make it suitable for use in radiators. Radiators are devices used to transfer heat, so the type of conductivity that would be relevant here is related to heat transfer.

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