Group 1 elements are known as Alkali Metals. The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution. This trend is shown in the figure below: The metals in this series are relatively light— lithium, sodium, and potassium are less dense than water (less than 1 g cm -3 ). These elements are all much too active to exist in nature in their native state. A brief introduction to flame tests for Group 1 (and other) metal ions. Group 1 This is one of the infographics I’ve been making as part of a classroom display. . The Group 1 elements in the periodic table are known as the alkali metals. Flame tests . The uses are, when you put it in water and then dry it, it becomes helium. . Some Group 1 compounds . Because beryllium's chemistry is so different from the other group 2 elements, the term "alkaline earth" is usually restricted to Mg, Ca, Sr, Ba, Ra. . . As a result, Cs (melting point = 28.5°C) is one of only three metals (the others are Ga and Hg) that are liquids at body temperature (37°C). They are called s-block elements because their highest energy electrons appear in the s subshell. . . Group 1 elements and uses: As a Element: Lithium has a lot of uses. The alkali metals are the elements that make up Group 1 of the periodic table: lithium, sodium, potassium, rubidium, cesium, and francium. !Mg2+ has a similar charge density to Li+, so the two elements show some similar chemistry (e.g., tendency to form useful organometallic compounds). Progressing down group 1, the atomic radius increases due to the extra shell of electrons for each element. Table 21.3 Selected Properties of the Group 1 Elements… An unusual trend in the group 1 elements is the smooth decrease in the melting and boiling points from Li to Cs. element unique chemistry. It is also used to make tritium, types of batteries (shown above), These are lightweight and are not as toxic as lead and cadmium batteries. An unusual trend in the group 1 elements is the smooth decrease in the melting and boiling points from Li to Cs. As a result, Cs (melting point = 28.5°C) is one of only three metals (the others are Ga and Hg) that are liquids at body temperature (37°C). Go to inorganic chemistry menu . Uses and Occurrences: How the element is (or was) used or where it is found. Click to find more info about each use or occurrence. 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