Iridium and osmium have the highest densities whereas lithium has the lowest density. ^ This element has not been discovered/synthesized. Its way down in the f-block, and its not a commonly encountered element, but all those down there are considered metals. Density: Metals have high density and are very heavy.They typically display a mix of metallic and nonmetallic characteristics. , indicates the mass number of the longest-lived isotope of the element or characteristic isotopic composition. Metalloids: Metalloids possess properties that fall between metals and nonmetals. Elements to the left are metals and nonmetals are to the right. The metalloid group separates the metals from the nonmetals. This periodic table shows the three different groups of elements. Also, Rubidium has lower melting point and lower boiling. It has a very less Ionization energy, that means very less energy is required to remove the valence electrons from its orbit. Also it possesses only one electron in the outermost orbit. Non-malleable metals such as tin will break apart when struck by a hammer. Rubidium is a group 1 element and it has bigger atomic size compared to the elements of other groups. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj The element does not have any stable nuclides, and a value in brackets, e.g. The elements of the periodic table can be broken into three different groups: Metals, Metalloids, and Nonmetals. Gold, silver, aluminum, iron, and copper are malleable.^ The atomic weight of commercial Lithium can vary between 6.939 and 6.996-analysis of the specific material is necessary to find a more accurate value.^ a b c d e f g h i j k l m n o The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.^ a b c d e f g h The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value. Alloys are mixtures of a metal element with one or more metal, nonmetal or metalloid elements.^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.Most metals are silvery, although some like gold, cesium, and copper are colored. Melting and Boiling Points : Metals have high melting and boiling point. Element categories in the periodic table Metals Tungsten, platinum, osmium, gold, and iridium are extremely dense. Iridium and osmium have the highest densities where as lithium has the lowest density.
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