The statement that tin has a value of 10, which is the highest of all elements, is not accurate. The number you are referring to is likely the oxidation state of the element in certain compounds or chemical reactions. The oxidation state indicates the number of electrons an atom has gained or lost when forming a chemical bond.
Tin (Sn) can have different oxidation states, including +2 and +4, among others. It does not have a universally assigned value of 10.
As for technetium (atomic number 43) and promethium (atomic number 61), they are both radioactive elements, and their most stable isotopes do not have a stable oxidation state. Technetium typically exhibits oxidation states ranging from -1 to +7, while promethium is predominantly found in the +3 oxidation state.
It's important to note that the concept of "value" in relation to elements can be interpreted differently depending on the context. If you provide more information or clarify the specific aspect you are referring to, I can provide a more detailed response.