# What is the electron configuration of d-block ions, for example V+?

##### 1 Answer

**EXAMPLE: TYPICAL TRANSITION METAL**

If we start from vanadium atom, it is easier to think about.

Since **atomic number**

Using the **noble gas configuration**, we reference the previous noble gas, which is

#color(green)([Ar]3d^3 4s^2)# .

Since the

In fact, the orbital potential energies are

The ionization can be written as follows:

#"V" -> "V"^(+) + e^(-)#

Thus, the electron configuration for

#color(blue)([Ar]3d^3 4s^1)# ,

but it is ** not** reasonable to predict:

#color(red)([Ar]3d^2 4s^2)# .

The actual observed result is

**EXAMPLE: ATYPICAL TRANSITION METAL**

In general you should be asked for electron configurations of transition metals that follow the trend of the

For instance, **yttrium** has the electron configuration

#[Kr]5s^2 4d^1# ,

and in fact, the *higher* in energy than the

#color(blue)([Kr]5s^2)# .

And we indeed see that if we look here for reference.