Among the 28 isotopes 60Co is the most stable one with more than 5 years of half-life. Cobalt’s isotopes are identified below.Ĭobalt has a total of 28 radioactive isotopes. Isotopes are the forms of atoms of a particular periodic element that are different by the number of nucleons but similar by atomic number.

The ionic radius of Cobalt ions (Co 2+) can be found in a range of 54-69 for different ions of Co. Van der Waal’s radius of elements refers to the radii of imaginary hard sphere of an atom of the element. Van der Waal’s radius of Cobalt is 200 pm. Boiling point is the amount of temperature at which an element changes its state from liquid to gas through evaporation. Melting point refers to a particular point of temperature at which the element start changing its state from solid to liquid. The melting point of Cobalt in different unit is 1495 ☌ (1768 K, 2723 ☏). The atomic density of Cobalt is 8.90 g/cm3 as atomic density is the number of atoms or nuclides ion per cm3 of an element. It increases from top to bottom of groups in the table. Electronegativity means the affection for atoms of an element on shared electrons.

Cobalt Electronegativity according to PaulingĮlectronegativity of Cobalt in Pauling scale is identified as 1.88. The total weight of a single atom of an element is called atomic weight. This Atomic weight and atomic mass are relative terms in chemistry. Cobalt Atomic number Cobalt atomic weightĪtomic weight of Cobalt is 58.933195 u. Atomic number can be defined as the number of protons and electrons, which are same anyway. It means Cobalt has 27 protons and 27 electrons. The blocks in periodic table of individual elements are recognised by their atomic orbitals and vacancies in valence shell. Cobalt block in periodic tableĬobalt is placed at d-block as it has vacant d-orbital in its atom. Periods are the rows where the elements are horizontally arranged by the descending order of their atomic number. Cobalt period in periodic tableĬobalt can be found in the 4 th period of the table.

The number of valence electrons in an elements determines its position to belongs to a group. Groups refer to the columns in periodic table where the vertical arrangement of elements is put in ascending order by their atomic number. Cobalt group in periodic tableĬobalt is placed at Group 9 in the periodic table. The first two letters of the word ‘Cobalt’ are used as its symbol. Symbols are the one or two letter designation of elements for identifying and differentiating them from each other. The chemical properties of cobalt such as its melting and boiling point, electronegativity, isotopes and chemical appearance are going to be discussed throughout this article. Starting from its position, participating in bonding and chemical reactions overall actions of the element are regulated by the chemical properties.Ĭhemical properties of Cobalt are found from internal structure of the element. Let us define chemical property below:Ĭobalt chemical properties are those characteristics that chemically influence the existence of Cobalt in the periodic table. Cobalt chemical properties are noticed to share some knowledgeable facts about the periodic element Cobalt.