Tungsten is a metal in group VIB of the periodic table with atomic number 74, an atomic weight of 183.85, and a density of 19.3 Mg/m 3. Its melting point is 3410 C, and it boils at 5930 C. In the ...

The ability of electron microscopes to reveal the locations of the atoms in samples has increased steadily over recent decades, but there has been less progress in their ability to identify these ...