I'm an electrical engineer and not a chemist, so please excuse me if this is obvious.
When soft-soldering electronic parts, we’re normally taught to clean copper of oxides (like using flux and so on) before soldering. Also I’ve observed that when heating copper to $\ce{\approx 200 ^\circ C}$ copper changes colour and builds an oxide layer. So why is copper considered a noble metal? Shouldn’t it be resistant to oxidation?
If the definition of noble metal is “less oxidation” instead of “no oxidation": Does that mean that gold and silver also build a small oxide layer in the $\pu{25 ^\circ C} - \pu{200 ^\circ C}$ temperature range?