The electron configuration for dubnium (Db) is correct, but the electron configuration for cadmium (Cd) is not correct.
The electron configuration for cadmium is:
[Kr]4d105s2
You have written the electron configuration for cadmium as:
[Xe]6s24f14
This is the electron configuration for pontium (Po), which is two elements below cadmium in the periodic table.
It is common for students to confuse the electron configurations of neighboring elements, so this is an understandable mistake.
To help you remember the electron configurations of the elements, I recommend using a mnemonic device like the Aufbau principle.
The Aufbau principle states that electrons fill up the orbitals in order of increasing energy.
The energy of an orbital depends on its principal quantum number (n) and its azimuthal quantum number (l).
Orbitals with the same n and different l values have the same energy, but orbitals with the same l and different n values have different energies. Orbitals with lower n values have lower energies.
For example, to write the electron configuration for cadmium, you would start by filling up the 1s orbital with two electrons.
Then, you would fill up the 2s orbital with two electrons, followed by the 2p orbital with six electrons.
Next, you would fill up the 3s orbital with two electrons. Finally, you would fill up the 3d orbital with ten electrons. This gives you the electron configuration for cadmium:[Kr]4d105s2