Atomic Structure:

Very pure tungsten is relatively soft; at least it can be cut with an ordinary hacksaw. However, small amount of impurities render the metal hard and brittle. It is sometimes described as being steely gray or tending towards a white color. The appearence, like its ductility, depends a lot on the purity of the samples.

Tungsten is a chromium metal in group VIB on the periodic table of the elements. It is quite similar to the two elements appearing above it on the table, molybdenum (Mo) and chromium (Cr). Tungsten has total of 74protons, 74 electrons and 110 neutrons.  While tungsten has the highest melting temperature of all the elements, it is straggle on the right and left by elements having the second- and third- highest melting points, rhenium (Re) and tantalum (Ta).                                                                                 

source:  Periodic Table by Yinon Bentor