you will notice that the atomic mass on the periodic table is a decimal; that's because the number is a weighted average of the various naturally-occurring isotopes of an element based on their ...

Scientists have discovered a new way of creating superheavy elements by firing supercharged ion beams at dense atoms. The ...

Research on moscovium and nihonium shows they are more reactive than flerovium and subject to notable relativistic effects, ...

Fermium studies indicate nuclear shell effects diminish as nuclear mass increases, emphasizing macroscopic influences in ...

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table’s arrangement also allows scientists to discern trends in ...

The first periodic table to become generally accepted was that of the Russian chemist Dmitri Mendeleev in 1869: he formulated the periodic law as a dependence of chemical properties on atomic mass.

The periodic table was arranged by atomic mass, and this nearly always gives the same order as the atomic number. However, there were some exceptions (like iodine and tellurium, see above), which didn ...

The laws of chemistry Mendeleev (1834-1907) created his early periodic table in 1869. He took the 63 known elements and arranged them into a table, mainly by their atomic mass. Although he wasn't ...