Question

how do metals get tatnished​

Answer 1

Answer:

Ametal tarnishes due to oxidation. It forms and oxide layer on the metal.

eg: copper, when new it is shiny, but after a time outside, it goes green.

Another example is Iron

Answer 2

Answer:

Most of the metals tarnish because surface has higher energy as compared to the core of the material. Every system in this universe tends to decrease its energy. Hence , the metal surface will react with its surrounding environment and lower its energy. Generally , most of the metals they form an oxide layer by reacting with oxygen available in the atmosphere. For eg. Aluminium has a dull surface appearance due to the oxide layer.

Explanation: