Electron Config for Cd2+: Kr 4d10

In summary, the electron configuration for Cd 2+ is [Kr] 4d10. When removing electrons, they are taken from the s orbital in that period, so for Cd 2+, we remove 5s2. This follows the Aufbau principle, which states that electrons are removed in the reverse order they are added to the atom. However, there are exceptions to this rule.
  • #1
Veronica_Oles
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Homework Statement


Write the electron configuration for Cd 2+.

Homework Equations

The Attempt at a Solution


[Kr] 4d10

Whenever we remove electrons do we always remove it from the s orbital in that period. So for cadium ion we remove 5s2 correct? But let's say it's Mn 2+ would we remove the electrons from 4s?
 
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  • #2
In general we remove electrons in exactly opposite order we put them on the atom - do you know the Aufbau principle?

There are several exclusions though.
 
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  • #3
Borek said:
In general we remove electrons in exactly opposite order we put them on the atom - do you know the Aufbau principle?

There are several exclusions though.
Okay I see, yes I know the Aufbau principle.
 

1. What is the electron configuration for Cd2+?

The electron configuration for Cd2+ is Kr 4d10. This means that the Cd2+ ion has lost two electrons from its neutral atom configuration, which is Kr 4d10 5s2.

2. Why does Cd2+ have the electron configuration of Kr 4d10?

Cd2+ has the electron configuration of Kr 4d10 because it is a transition metal ion with a +2 charge. Transition metals tend to lose their outermost s electrons first before losing any d electrons. In this case, the Cadmium (Cd) atom has lost its two outermost s electrons, leaving behind the Kr 4d10 configuration.

3. How does the electron configuration for Cd2+ compare to that of the neutral atom?

The electron configuration for Cd2+ is different from the neutral atom because it has lost two electrons. The neutral Cd atom has an electron configuration of Kr 4d10 5s2, while the Cd2+ ion has an electron configuration of Kr 4d10.

4. What is the significance of the Kr 4d10 electron configuration in Cd2+?

The Kr 4d10 electron configuration in Cd2+ signifies that the ion has a full d subshell, which is a stable configuration. This stability is due to the fact that the d subshell is completely filled with 10 electrons, following the "18-electron rule" for transition metals.

5. How does the electron configuration for Cd2+ affect its chemical and physical properties?

The electron configuration for Cd2+ affects its chemical and physical properties in several ways. The full d subshell makes the ion more stable, which can affect its reactivity and ability to form compounds. Additionally, the loss of two electrons can also affect the ion's size and charge, which can impact its physical properties such as melting and boiling points.

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