Question

give the noble gas electron configuration for cadmium, element 48. 1 52 43

Explanation:

Step1: Identify the closest noble - gas before cadmium

The closest noble - gas to cadmium (atomic number 48) is krypton (atomic number 36). So, we start with [Kr].

Step2: Determine the remaining electrons

Cadmium has 48 electrons. After using the 36 electrons from krypton, we have 48 - 36=12 remaining electrons.

Step3: Fill the orbitals with the remaining electrons

The next orbitals are 5s and 4d. The s - orbital can hold 2 electrons and the d - orbital can hold 10 electrons. The electron configuration of the remaining 12 electrons is $5s^{2}4d^{10}$.

Answer:

[Kr] $5s^{2}4d^{10}$