сілтілі металл

сілтілі металл

The Group 1 elements, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr) react with cold water for form strongly alkaline hydroxide solutions, and are referred to as "alkali metals". Hydrogen is not considered an alkali metal, despite its position on some periodic tables.

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A formal ceremony to officially end a marriage by exchanging divorce vows and returning the wedding rings. As divorce becomes more common, a divorce ...