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Transcript of Alkali Metals
because they are so unstable. Other common compounds include Borax
(Sodium Tetraborate), Potash (Potassium Carbonate), and Baking Soda (Soduim Carbonate). Alkali Metals and the Melting Point The melting point of the Alkali Metals decreases as you proceed downward through the group. Starting at Lithium's melting point of 180 'C, it continues downward to Francium's melting point of 27 'C. Cesium has such a low melting point (88 'F) that it melts in your hand (body temperature at 98 'F) Density and the Alkali Metals The Trend of Density is that Alkali Metals become more dense as you proceed downward the group, except for potassium. Since the Alkali metals have the largest atomic radius in their period, but the lowest atomic number, they are the least dense elements in their respective periods. Boiling point Like with the melting point, the boiling point decreases further down in the periodic table. The Lowest known boiling point is 671 degrees Celsius, for cesium Potasium is essential in the body also. Alkali metals effects on humans- Continued Humans need 500 milligrams of sodium ions a a day. Cesium can replace potassium in the body, which will cause potassium deficiency All Alkali Metals have an effect on the body, whether positive or negative. Nuclear Stability All Alkali metals have radio active isotopes, but cesium and lithium do not have any naturally occurring isotopes There is no non-radioactive form of Francium