What is the number of valence electrons in cadmium (cd)?

The number of valence electrons in cadmium (Cd) is 2. 
electrons in each orbit: 
2
8
18
18
2 <- valence electrons

Hope this helps ;)

2. Valence electrons are the last number of the electron configuration which is on the bottom of the box on the reference table. the electron configuration for Cd is 2-8-18-18-2.

The answer is b i think

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"