Theoretical chemical element, which lacks protons and would occupy the "0" place in the periodic table of the chemical elements. Although its existence has not been proven, the name 'neutronium' is used for the mass released by neutron stars because of the overload of their core. The proposed symbol is Nu and we owe the name to the Estonian scientist Andreas von Antropoff who in 1926 assumed the existence of this atom composed only of neutrons. See neutron, proton.
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