These are aluminum atoms. An atom is the smallest particle of an element that has the properties of that element. Some properties of aluminum are: shiny, silver colored, fragile, and thin. Each element has its own type of properties. Chemists use symbols to represent elements. A symbol is a letter or picture used to represent something. Chemists use one or two lettters to represent elements. The symbol for aluminum is Al. The symbol for oxygen is O. A model of an oxygen molecule. The symbol for oxygen is O. O stands for one atom of oxygen.
OCCULT BLOOD Occult blood is blood that cannot be seen without a microscope. Normal urine does not contain any red blood cells, except femalesâ urine during menstruation. Occult blood in someoneâs urine can indicate kidney, bladder, prostate, or vaginal infections.UROBILINOGEN Urobilinogen is a breakdown product of the hemoglobin in red blood cells. It is not found in normal urine! Urobilinogen in a urine specimen may indicate the rapid destruction of red blood cells.ormal urine does not contain any red blood cells, except femalesâ urine during menstruation. Occult blood in someoneâs urine can indicate kidney, bladder, prostate, or vaginal infections.
occult blood. Type:Term. Definitions 1. blood in the feces in amounts too small to be seen but detectable by chemical tests.