The atomic mass in the periodic table is an average of the atomic mass of the isotopes of an element. For the atoms of the first 20 elements, the number of neutrons is either equal to or slightly ...

Periodic Table Chemistry: The periodic table of elements is a tabular arrangement of all known chemical elements, organised based on their atomic number, electron configurations, and recurring ...

The table starts with the simplest atom, hydrogen, and then organizes the rest of the elements by atomic number, which is the number of protons each contains.

The International Union of Pure and Applied Chemistry (IUPAC) has announced that four new elements — with atomic numbers of 113, 115, 117, and 118 — will be added to the periodic table.

For the first time in history, a change will be made to the atomic weights of some elements listed on the periodic table of the chemical elements posted on walls of chemistry classrooms and on the ...

150 years ago, Russian chemist Dmitrii Mendeleev created the periodic table of the elements, revolutionizing chemistry.

And by the way, Janet’s table did not stop at element 118, the highest atomic number atom now known, but also properly positioned the next two numbers.

At the far end of the periodic table is a realm where nothing is quite as it should be. The elements here, starting at atomic number 104 (rutherfordium), have never been found in nature. In fact ...

The new element doesn't have an official name yet, so scientists are calling it ununpentium, based on the Latin and Greek words for its atomic number, 115.

The modern incarnation of the periodic table organizes elements by rows based on atomic number—the number of protons in an atom's nucleus—and by columns based on the orbits of their outermost ...

Five elements at the heart of the periodic table will never look the same again, following an update to their atomic weights ...

The highest atomic number element in the periodic table is 118 but scientists believe that 33 Polyhymnia could be hiding an element of atomic number 164.