Why is silver considered a "type 1" metal although it has multiple oxidation states? [closed]








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I noticed that the metals I learned were "type 1" back in early chemistry class as they have one oxidation state including silver, aluminum, zinc, and cadmium. However, those metals weren't reported as "type 1" when I looked online. I noticed that although silver has three oxidative states, it is still listed as "type 1" metal. Does anyone know why we still categorize it as "type 1" or have an insight into what is still considered a "type 1" metal?




I haven't heard of this classification of metals before. Anyways, the below image is from [a nomenclature handout](https://www.amherst.edu/media/view/226859/original/Chem11%2B1011F%2BD1%2BNomenclature%2Bhandout.pdf) where silver has been considered "type 2" metal:


[![enter image description here](https://i.stack.imgur.com/fvBqI.jpg)](https://i.stack.imgur.com/fvBqI.jpg)


It's true that silver has oxidation states other than +1 but those are rarely encountered. So, it can get confusing and most of time, we may tend to consider that silver has only one oxidation state leading to it falling into "type 1" metal.


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