Which element does not show +4 oxidation state ?EuLaLuAll

The element that does not show a +4 oxidation state is La (Lanthanum).

Here's why:

1. Eu (Europium) can exhibit a +2 and +3 oxidation state. However, it can also show a +4 oxidation state under certain conditions.

2. La (Lanthanum) typically exhibits a +3 oxidation state and does not commonly show a +4 oxidation state.

3. Lu (Lutetium) can exhibit a +3 oxidation state and under certain conditions, it can also show a +4 oxidation state.

So, among the given options, La (Lanthanum) is the element that does not show a +4 oxidation state.