Question

the greenish layer seen from an copper is called a --------------------of metal​

Answer 1

Answer:

rust of the metal it forms gradually

Answer 2

Answer:

patina

Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.

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