This is known as iron-deficiency anemia, the most common type of anemia. Factors that can lower your body's supply of iron include: 1  blood loss (caused by ulcers, some cancers, and other conditions; and, in women, during monthly periods); 2  a diet that doesn't have enough iron in it;3  taking medications that interfere with the ability of the body to absorb iron; blood loss (caused by ulcers, some cancers, and other conditions; and, in women, during monthly periods); 2  a diet that doesn't have enough iron in it; 3  taking medications that interfere with the ability of the body to absorb iron; 4  an increase in the body's need for iron (for instance, in women during pregnancy).
Definition. An anion is an atom or a molecule which is negatively charged, i.e. has more number of electrons than protons. A cation is an atom or a molecule which is positively charged, i.e. has more number of protons than electrons.
Share. By Anne Marie Helmenstine, Ph.D. Definition: A polyatomic ion is an ion comprised of two or more atoms. Examples: The hydroxide cation (OH -) and the phosphate cation (PO 4 3-) are both polyatomic ions.y Anne Marie Helmenstine, Ph.D. Definition: A polyatomic ion is an ion comprised of two or more atoms. Examples: The hydroxide cation (OH -) and the phosphate cation (PO 4 3-) are both polyatomic ions.