Unfamiliar states of matter

[Sei Lam 3F]

As a slight follow-up to my earlier post, I've seen a couple of unfamiliar state of matter subscripts when viewing examples of chemical equations online, such as (cr), (cd), and (am). What do these abbreviations mean? Thanks!

[006248274]

One of them may be plasma? But i wouldn't worry about it as we haven't learned that in lecture

[Daniel P 3J]

(cr): This stands for "crystalline". It indicates that the substance is in a solid state with a well-defined, orderly crystalline structure. This is different from a general solid (s) which might not have such an ordered structure.

(cd): This is less common and might refer to "cadmium" if it's attached to a chemical element, or it could be a typo or a specific notation used in a particular context. Without more context, it's hard to be certain.

(am): This usually means "amorphous". An amorphous solid doesn’t have a well-defined crystalline structure, which is different from crystalline solids. Glass is a common example of an amorphous solid.