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Einsteinium is a synthetic element with an atomic number of 99 and symbol Es. It belongs to the group of Actinide elements and is located in Period 7 of the Periodic Table.
The atoms of all the chemical elements have different oxidation numbers and are able to absorb or lose electrons in the presence of other chemical elements. Oxidation number 0 is an element in its uncombined state (no other elements are present) while oxidation number 1 is the most common oxidation state for all the elements when combined with other elements.
There are a number of ways to determine the oxidation number of an element including its electron affinity and ionization energy. Ionization energy is a measurement of the tendency of an atom or molecule to gain or lose an electron and can be expressed as kJ/mole.
Electron affinity is a measure of the tendency for an atom to attract or repel electrons and can be expressed as kJ/mole.
Using this information it is possible to calculate the density of an element by measuring the amount of electrons it contains and multiplying that by its atomic mass. This gives the density of the material in grams per cubic centimeter.