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The number of valence electron in an element is the number of electrons in the external shell. This is likewise the variety of electrons that take part in bond formation with comparable or various atoms. 

For Vanadium, the atom number is 23 and the electronic configuration given is 

`1s^2, 2s^2, 2p^6,...


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The variety of valence electron in an element is the number of electrons in the external shell. This is likewise the number of electrons that get involved in bond development with similar or different atoms. 

For Vanadium, the atomic number is 23 and also the electronic configuration offered is 

`1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^3, 4s^2`

Thus vanadium has 5 valence electrons and also during ionic bonding, s-shell electrons space lost very first and 보다 d-shell electrons would certainly be lost.

For Copper, the atom number is 29 and also the digital configuration is offered as

`1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^10, 4s^1`

Copper likewise happens to be a shift element and is known to have actually two valence states: cuperous (1 valence electron) and also cupric (2 valence electrons). In the former, copper will lose the 4 s electron, while in the last it will lose 1 electron from 3 d covering as well.

Hope this helps.

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