Which of the element shows `+4` oxidation state?

In goup 14, the tendency of the elements to show +4 oxidation state decreases down the group while tendency to show+2 oxidation state increases. Explain

In the first transition series of elements, which element shows highest oxidation state?

In the first transition series of elements, which element shows highest oxidation state?

Which element show highest oxidation state in actinoid

Which element show highest oxidation state in actinoid

The atomic number of an element which shows the oxidation state of + 3 is