Question

Why copper have to.lose an electron in order to become transition metal?

Answer 1

Answer:

When it forms ions, it always loses the two 4s electrons to give a 2+ ion with the electronic structure [Ar] 3d10. ... In the Cu+ ion the electronic structure is [Ar] 3d10. However, the more common Cu2+ ion has the structure [Ar] 3d9. Copper is definitely a transition metal because the Cu2+ ion has an incomplete d level.

Answer 2

Answer:

because transition element is that which has incomplete d subshell in simple or at any oxidation state

so as copper not have incomplete d subshell in its simple state

so it has to lose electron to form a incomplete d subshell to form a transition element