➤ In the functioning of all body systems, it is not considered an essential element and no noticeable manifestation of biological activity is observed.

➤ As a rule, it is not localized in the body and is not important in the course of physiological processes.

➤ ​Deficiency is unlikely and there are no symptoms

➤ Nb is used as a surgical suture material.

➤ Characterized by hypoallergenic effect.

➤ Niobium threads are widely used in surgical practice for suturing tendons, blood vessels, nerve fibers.

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➤ Causes irritation of the mucous membranes of the eyes, respiratory tract and skin, which may result in allergic reactions.

➤ No specific antidote available.

➤ Nb melts at t = 2468 °C and boils at t = 4927 °C.

➤ Insoluble in acids (except hydrofluoric).

➤ Nb⁺⁵ is amphoteric.

➤ Nb salts are niobates.

➤ Forms complex compounds.

➤ Nb is a superconducting material.