However, the meaning of the term has changed over time, and from the last half of the 20th century onward it has been used legitimately to refer to extremely dense phases of matter resembling the neutron-degenerate matter postulated to exist in the cores of neutron stars. before the discovery of the neutron itself) for the conjectured 'element of atomic number zero' that he placed at the head of the periodic table. ![]() The word was coined by scientist Andreas von Antropoff in 1926 (i.e. The term was originally used in science fiction and in popular literature to refer to a highly dense phase of matter composed primarily of neutrons. Neutronium is a hypothetical extremely dense phase of matter. Unknown Miscellaneous Most-stable isotopes ![]() Nt ↓ periodic table - extended periodic table DETAILED DESCRIPTION OF ALL THE ELEMENTS WITH HIGH RESOLUTION PICTURES
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