➤ Cesium accumulates in the heart muscle and red blood cells.

➤ Stimulates the activity of adrenal and gonadal hormones.

➤ Excessive Cesium causes pharyngeal reflex, gastrointestinal disorders, cephalgia, radiation sickness, muscle asthenia, hypokalemia, and allergic reactions of the eyes and external body integuments.

➤ Cesium deficiency leads to diseases of the cardiovascular system, central nervous system, and regulates the growth and development of the body.

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➤ In radiotherapy diagnostics, the ¹³⁷Cs isotope is used to treat dermatitis, eczema, and cancer.

➤ Cesium is included in mixtures with other drugs for the treatment of necrotizing inflammatory skin defects.

➤ Negative consequences ¹³⁷Cs is manifested by tissue damage and the development of radiation sickness.

➤ There is no antidote.

➤ The melting point of Cs is 28.5 ^oC.

➤ The metal density is 1.87.

➤ Cs is a very active metal that absorbs oxygen in a deep vacuum.

➤ Interaction with ice at t=-116 ^oC;

➤ with S and P - explosion.

➤ Industry applications: radio engineering, optics, electrical engineering, catalysis, infrared signalling, cesium plasma.

➤ At a pressure of 100 thousand atm, the volume of Cs decreases by a factor of 3.

➤ Cesium "atomic clocks" are the most accurate in the world.