What element is represented by this electron ground state configuration :
[Kr] 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d2 7s2
Is this really Krypton?
See my response above.
The electron ground state configuration you provided represents the electronic structure of an element. However, it does not correspond to the element Krypton (Kr).
To determine which element corresponds to this electron configuration, we need to find the elements that match the number of electrons in each subshell.
Here's how you can do it step-by-step:
1. Identify the noble gas core:
- The electron configuration starts with "[Kr]", indicating that the noble gas Krypton is the core configuration up to this point.
2. Determine the remaining electrons:
- After the noble gas core, we have the following electron configuration: 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d2 7s2
- Add up the electrons in each subshell:
- 4d: 10 electrons
- 4f: 14 electrons
- 5s: 2 electrons
- 5p: 6 electrons
- 5d: 10 electrons
- 5f: 14 electrons
- 6s: 2 electrons
- 6p: 6 electrons
- 6d: 2 electrons
- 7s: 2 electrons
3. Calculate the total number of electrons:
- Summing up the electrons in each subshell, we get a total of 68 electrons.
Now we can identify the element that corresponds to this electron configuration. To do this, we need to find an element with an atomic number (number of protons) that matches the total number of electrons.
The element that matches the electron configuration you provided, with 68 electrons, is Erbium (Er). Erbium has an atomic number of 68, which means it has 68 electrons.
Therefore, the correct answer is Erbium (Er), not Krypton (Kr).