![]() This diatomic gas has a relatively low reactivity, as it is stable due to the strong energy required to break its triple bond. It makes up about 78% of Earth’s atmosphere. Nitrogen chemical properties explained: Nitrogen is an essential element with symbol N and atomic number 7. What Are the Chemical Properties of Nitrogen? The chemical classification of astatine are listed below: The allotropic forms of astatine has not yet been found due to its radioactive nature, unstable form with short lifetime. Let us check if At has its allotropic forms. Astatine allotropic formsĪllotropes are chemical forms of a substance with different chemical properties in the same physical state. It can be used to find properties of At during database search. The CAS number of astatine is which is unique only for At. The electronic configuration of astatine is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 5s 2 5p 6 4f 14 5d 10 6s 2 6p 5. 1 and +1 are mostly observed in astatine. The oxidation states shown by astatine are -1, +1, +3, +5, +7. The third energy of ionization of astatine is not yet found. The second energy of astatine is not yet estimated as it achieves nearby stability after removing the only unpaired electron. The first ionization energy of astatine is found to be 899 kJ/mol for removing the only unpaired electron in the p subshell. It follows Hund’s rule and Aufbau principle. The electronic shell of astatine is 2, 8, 18, 32, 18, 7. Astatine electronic shellĮlectronic shell is a scientific representation of the distribution of the total number of electrons present in different orbits. Isotopes Abundance Decay mode 209At Synthetic α, β + 210At Synthetic α, β + 211At Synthetic α, ε Isotopes, abundance and decay mode of Astatine element. They are listed below with their abundance and decay mode. The total number of isotopes observed for astatine are 3. Let us check in details below for astatine. Isotopes are chemical forms of the same element with same atomic number but different mass number. The ionic/covalent radius of astatine is not yet estimated or predicted due to its heavy form with low stability. The Van der Waals radius of astatine is calculated to be 200 pm (1pm = 10* -12) between the nuclei of two At atoms. It is high as compared to other halogens due to its large size. The boiling point of astatine is found to b 336.8 0C. The melting point of astatine is 301.8 0C. It is extremely heavier than water due to its large size. The atomic density of astatine is estimated to be around 8.91 to 8.95 g/cm 3. The electronegativity of astatine according to Pauling scale is 2.2 lower than iodine and hydrogen as observed from the Pauling scale chart. Astatine Electronegativity according to Pauling Astatine has 125 neutrons calculated using Mass number-Atomic number = neutrons. Astatine has 85 positively charged protons in the nucleus and 85 electrons in the orbit. ![]() Astatine block in periodic tableĪstatine is a p-block element as observed from the periodic table due to the last electron entering p subshell. It is the second last period in a periodic table. Astatine period in periodic tableĪstatine belongs to the sixth period of a periodic table. The group that Astatine belongs to in a periodic table is 17. Atomic symbol of Astatine with atomic mass and atomic number on extreme top left and bottom left. The atomic or chemical symbol of Astatine is At named after ‘astatos’, a Greek word for unstable form. Let us study more properties about astatine like atomic weight, mass number, CAS number, etc. It is classified as a non metal or metalloid.Īstatine has low vapor pressure and sublimes easily than iodine. The half lives are shorter than one second for most of the isotopes. It shows extreme radioactive nature making it unstable and difficult to synthesize as it vaporizes easily. Let us discuss more facts about astatine below.Īstatine is generally produced synthetically. ![]() Astatine has few isotopic forms with short lifetime. Astatine is one of the rarest occurring element present in the Earth’s crust.
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