Question

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

Explanation:

Step1: Identify the nearest noble - gas before cadmium

The nearest noble - gas before cadmium (atomic number 48) is krypton (atomic number 36). So, the noble - gas core is [Kr].

Step2: Determine the remaining electrons

Cadmium has 48 electrons. After using 36 electrons for the [Kr] core, there are 48 - 36=12 remaining electrons.

Step3: Fill the remaining orbitals

The electron configuration of the remaining 12 electrons is $5s^{2}4d^{10}$.

Answer:

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