Alkali metals
The alkali metal belongs to the first group of the periodic table of elements, except hydrogen, which includes lithium (Li), sodium (Na), potassium (K), rub (Rb), cesium (Cs) and franc (Fr). The characteristics of alkali metals include: Since these metals are alkali metals when they interact with water, hydrogen atoms divide into water molecules to form hydrogen, and the other hydrogen atoms form hydroxides with oxygen. All the elements of the first group in the periodic table have valence electrons, and the electron distribution has s1, which means that it participates in chemical reactions. The alkali metal is shiny, soft enough to cut the knife, usually white and yellowish-white. When placed in a flame, most produce a unique color, such as bright red in lithium and yellow in sodium. Heated potassium produces purple, dark red and light blue enamel. Therefore, they can be distinguished according to the color produced by the metal when heated. Sodium is the sixth-highest element ...