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A rare and highly radioactive metal (although sometimes classified as a metalloid) with no stable isotopes, polonium is a chalcogen and chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth.
Like the periodic table, the list below organizes the elements by the number of protons in their atoms; ... Polonium [cr] 16 6 p-block [209] [a] 9.196: 527:
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
Here [Ne] refers to the core electrons which are the same as for the element neon (Ne), the last noble gas before phosphorus in the periodic table. The valence electrons (here 3s 2 3p 3) are written explicitly for all atoms. Electron configurations of elements beyond hassium (element 108) have never been measured; predictions are used below.
The periodic table, ... Polonium: Astatine: Radon: Francium: Radium: ... and also changes depending on how many electrons are removed from the atom.
The 9s electrons should have ionization energies comparable to those of the 3s electrons of sodium and magnesium, due to relativistic effects causing the 9s electrons to be much more strongly bound than non-relativistic calculations would predict. Elements 165 and 166 should normally exhibit the +1 and +2 oxidation states, respectively ...
Polonium: Astatine: Radon: ... are the chemical elements in group 15 of the periodic table. ... it leaves two unused electrons in a lone pair unless there is a ...
Polonium: Astatine: Radon: Francium: Radium: Actinium: ... A thorium atom has 90 electrons, ... In the periodic table published by Dmitri Mendeleev in 1869, ...