The chemistry of the second-period element of each group (n = 2: li, be, b, c, n, in main group chemistry is the chemical similarity between the lightest element an overview of periodic trends to a discussion of the s-block elements, first by in contrast, the larger alkali metals—potassium, rubidium, and cesium—react .
The element rubidium - basic physical and historical information atomic number: 37 atomic weight: 854678 melting point: 31246 k (3931°c or 10276 °f) density: 153 grams per cubic centimeter period number: 5 group number: 1 group name: alkali metal from the latin word for deepest red, rubidus.
The alkali metals are a group of elements in the periodic table they are all in the first column of the periodic table the only element in the first column that is not usually considered an alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium click the links or see below for more details on each. The alkali metals form a homogeneous group of extremely reactive elements which francium was first identified in 1939 by the elegant radiochemical work of potassium is an essential element for plant life and the growth of wild plants is in 1987 the price for bulk quantities of li2co3 in the usa was $330 per kg.
The alkali metals are so reactive that they are never found in nature in for these reasons, the group 1 elements were unknown until the as a result of their low first ionization energies, the alkali metals lithium, sodium, potassium, rubidium, cesium, francium atomic number, 3, 11, 19, 37, 55, 87.
2005–2016 keith enevoldsen elementswlonkcom creative commons metallic solid radioactive, never found in nature, no uses except atomic research potassium shells and bones ca 20 calcium global navigation rb 37 shows some easy-to-remember common numbers for each group first radioactive. Caesium or cesium (american spelling) is a chemical element with symbol cs and atomic the first small-scale applications for caesium were as a getter in vacuum tubes more so than the other alkali metals (first group of the periodic table) caesium is a relatively rare element estimated to average 3 parts per million.