The metallic elements which all react to water are found in the same group, named Alkali metals, or also known as group Ia.
The six chemical elements that make up Group 1 (Ia) of the periodic table—lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr)—are together referred to as alkali metals. The name "alkali metals" refers to how they react with water to produce alkalies (i.e., strong bases capable of neutralising acids).
Due to their high level of reactivity, alkali metals are typically found in nature in combination with other elements. Simple minerals that are soluble in water are those like sylvite (potassium chloride, KCl), halite (sodium chloride, NaCl),and carnallite (a potassium-magnesium chloride, KCl MgCl2 6H2O). However, the Earth's crust contains a much greater quantity of more complicated, water-insoluble minerals.
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