The term ‘weighted mean mass’ takes into account the different contribution of each isotope to the overall mass. Relative atomic mass is not the same as mass number. Mass numbers close mass ...

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 ...

Each element has unique chemical properties and is fundamental to understanding the composition and behavior of matter in the ...

This Q-value calculation programme allows you to calculate reaction Q-values and threshold energies and decay Q values based on the 1995 Update to the Atomic Mass Evaluation and to retrieve other ...

They could see that relative atomic masses of the elements increased by steps. Many elements were unknown, so these early tables were incomplete. They also contained errors – some elements that ...

He took the 63 known elements and arranged them into a table, mainly by their atomic mass. Although he wasn't the first to do this, his interpretation involved a leap of ingenuity, in that he put ...

Mendeleev never received a Nobel Prize for his work, but element 101 was named Mendelevium after him, an even rarer distinction. It wasn’t until 1913, six years after Mendeleev’s death that the final ...

North Carolina State University scientists discovered that some of the Miky Way galaxy's oldest stars might produce elements with atomic masses greater than 260. According to a statement by the ...