The team of physicists from The University of Arizona say they were motivated by the possibility of Compact Ultradense ...

First 20 elements of the periodic table: ... Well, each element has its distinct properties owing to its atomic number, atomic mass, electronegativity and electron gain enthalpy.

Atoms of the same element with different numbers of neutrons are called isotopes of that element. The atomic mass in the periodic table is an average of the atomic mass of the isotopes of an element.

Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications. When you purchase through links on our site, we ...

Some elements have more than one stable (nonradioactive) isotope—variants of the same substance, but with different numbers of neutrons in their atomic nuclei that alter the mass. (The element's ...

Carbon. Carbon is the next most common element in the human body, making up 18% of the body by mass. Its role is mostly structural, forming the “backbone” of many organic molecules.