Question

Why does copper has a valency 1 or 2 even though it couldn't attain the electronic configuration ns2 np6 by gaining or losing 1 or 2 electrons ?

Answer 1

Answer:

Hope you like my answer

Explanation:

because a copper has variable valency

Answer 2

Answer:

Generally, d-block elements have variable oxidation states. If you observe the electronic configuration of copper, the valence shell will have 3d10 4s1.

Hence it can lose 1 electron and come to 3d10 4s0 state, which is the state of Argon which is stable. However, it can also lose another electron and come to 3d9 4s0 state and have an oxidation state of +2.

Even though this requires a good amount of energy, that energy can be compensated by energy released during bond formation or hydration energy. In fact, the +2 state is much more common in compounds.

Explanation:

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