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# How to find valency of zinc?

You take a look at its .

Zinc is located in period 4, group 12 of the and has an equal to **30**.

This means that neutral zinc atom has a total of **30** electrons surrounding its nucleus. To see how many of these electrons are , write the of a neutral zinc atom.

##"Zn": 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10##

or, if you use the

##"Zn": ["Ar"] 4s^2 3d^10##

Notice that the outermost shell, which for zinc is the **fourth shell**, ##"n=4"##, has two electrons.

This means that zinc can lose the two electrons located in the **4s-orbital** to be become the ##Zn^(2+)## cation.

##"Zn"^(2+): ["Ar"] 3d^10##

Notice that the **3d-orbital** is completely filled, which means that these electrons behave like core electrons and cannot be considered .

Therefore, zinc has only **2** , both located in the **4s-orbital**.