Aluminum is a metal in group IIIA of the periodic table with atomic number 13, an atomic weight of 26.982, and a density of 2.70. It has a melting temperature of 660 C. The electronic configuration of ...

Scientific research has discovered some elements that stand out due to their exceptional density and atomic weight. They make up the heaviest metals on earth and are used in various fields.

Over the past few decades, the atomic mass of the electron has been determined ... The first such direct determination dates back to 1980, when Gräff et al. made use of a Penning trap to compare ...

Atomic number 6, atomic weight 12.01115. Manganese (Mn): Manganese is a brittle, metallic element that exists in the ore of pyrolusite. When making steel, it reacts with sulfur and helps to ...

In fact, the atomic weight of some elements varies depending on where you are on Earth. Most of the mass of an atom resides in its nucleus, composed of protons and neutrons (with the exception of ...

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 ...