Respuesta :
Rubidium and cesium have similar chemical properties because in the ground state the atoms of both elements each have one electron in the outermost shell.
A German chemist, organized the elements by atomic mass and grouped them according to their chemical properties. Later , Dmitri Mendeleev, organized all the known elements according to similar properties. He left gaps in his table for what he thought were undiscovered elements, and he also made some bold predictions regarding the properties of those undiscovered elements. When elements were later discovered whose properties closely matched with the Mendeleev’s predictions, his version of the table gained favor in the scientific community. This he predicted because certain properties of the elements repeat on a regular basis throughout the table that is, basically they are periodic, therefore it became known as the periodic table.
Elements that have similar chemical properties are grouped in columns called groups or families) As well as being numbered, some of these groups have names—for example, alkali metals (the first column of elements), alkaline earth metals (the second column of elements), halogens (the next-to-last column of elements), and noble gases (the last column of elements).
Hence Rubidium and cesium have similar chemical properties because in the ground state the atoms of both elements each have one electron in the outermost shell.
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