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Chemistry > Hardness of the Elements

The table below shows relative hardness of the elements on the Mohs scale.

Number Symbol Name Mohs hardness
3 Li lithium 0.6
4 Be beryllium 5.5
5 B boron 9.3
6 C carbon (graphite) 0.5
6 C carbon (diamond) 10.0
11 Na sodium 0.5
12 Mg magnesium 2.5
13 Al aluminium 2.75
14 Si silicon 6.5
16 S sulfur 2.0
19 K potassium 0.4
20 Ca calcium 1.75
22 Ti titanium 6.0
23 V vanadium 7.0
24 Cr chromium 8.5
25 Mn manganese 6.0
26 Fe iron 4.0
27 Co cobalt 5.0
28 Ni nickel 4.0
29 Cu copper 3.0
30 Zn zinc 2.5
31 Ga gallium 1.5
32 Ge germanium 6.0
33 As arsenic 3.5
34 Se selenium 2.0
37 Rb rubidium 0.3
38 Sr strontium 1.5
40 Zr zirconium 5.0
41 Nb niobium 6.0
42 Mo molybdenum 5.5
44 Ru ruthenium 6.5
45 Rh rhoium 6.0
46 Pd palladium 4.75
47 Ag silver 2.5
48 Cd cadmium 2.0
49 In indium 1.2
50 Sn tin 1.5
51 Sb antimony 3.0
52 Te tellurium 2.25
55 Cs caesium 0.2
56 Ba barium 1.25
57 La lanthanum 2.5
58 Ce cerium 2.5
72 Hf hafnium 5.5
73 Ta tantalum 6.5
74 W tungsten 7.5
75 Re rhenium 7.0
76 Os osmium 7.0
77 Ir iridium 6.5
78 Pt platinum 3.5
79 Au gold 2.5
80 Hg mercury 1.5
81 Tl thallium 1.2
82 Pb lead 1.5
83 Bi bismuth 2.25
90 Th thorium 3.0
92 U uranium 6.0