Question

what is the number of valence electrons in cadmium (cd)?
1
2
10
12

Explanation:

Step1: Write the electron - configuration of cadmium

Cadmium (Cd) has an atomic number of 48. Its electron - configuration is $[Kr]4d^{10}5s^{2}$.

Step2: Determine the valence electrons

The outermost shell electrons are valence electrons. For Cd, the outermost shell is the 5th shell with 2 electrons in the 5s orbital.

Answer:

2