Rachel is a 35 year old school teacher who has no man in her life and lives with her mother. When a man from the big city returns and asks her out, she begins to have to make decisions ... See full summary Â».
As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group. Alkali metals can explode if they are exposed to water.
Definition of explosion for English Language Learners. : 1  the sudden, loud, and violent release of energy that happens when something (such as a bomb) breaks apart in a way that sends parts flying outward. : 2  a sudden and very fast increase. : 3  a sudden expression of some strong emotion.