These nutrients are elements required by plants in much smaller quantities than the major nutrients that make up the formulation numbers. There are other major nutrients such as calcium that are usually provided through other materials like limestone or gypsum. Help on diagnosing Nutrient Deficencies is available from your extension service. Most will probably be a fraction of a percent. This is ok in that these are micro-nutrients and needed only in very small quantities.
Some fertilizers contain only organically derived nutrients.
These will be formulated on the bag the same as the chemically produced fertilizers. The fact that they are organically derived will be displayed on the bag. This is a good selling point in today's market. Beware that organically derived does not necessarily mean the fertilizer meets official organic specifications. The extraction of the nutrients from their source may have involved chemical processes that alter the nutrient form so that it is no longer recognized as an organic form.