The Reactivity Series Reaction with Water The reactivity of alkali metals escalates dramatically as the group is descended. Lithium, for instance, is soft enough to be cut with a standard knife and floats on water due to its low density.
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This singular electron configuration dictates their position and drives their intense reactivity, making them a fundamental study subject in chemistry. Sodium is used in the production of organic chemicals and as a heat transfer medium in nuclear reactors.
Potassium ignites the hydrogen gas, resulting in a lilac flame, while rubidium and cesium explode on contact, releasing enough energy to ignite the hydrogen instantaneously. They are never encountered in a pure, elemental state in nature, always existing as ionic compounds within minerals and salts.
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This trend results in cesium having a melting point near human body temperature, making it a liquid under specific conditions. Water is an absolute hazard, as contact leads to violent hydrogen evolution and potential ignition.
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