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number	symbol	name	Mohs hardness	Vickers hardness (GPa)	Brinell hardness (GPa)
3	Li	lithium	0.6
4	Be	beryllium	5.5	1.67	0.6
5	B	boron	9.5	49
6	C	carbon	1.5 (graphite)
6	C	carbon	10.0 (diamond)
11	Na	sodium	0.5		0.00069
12	Mg	magnesium	2.5		0.26
13	Al	aluminium	3	0.167	0.245
14	Si	silicon	6.5
16	S	sulfur	2.0
19	K	potassium	0.4		0.000363
20	Ca	calcium	1.5		0.167
21	Sc	scandium			0.75
22	Ti	titanium	6.0	0.97	0.716
23	V	vanadium	7.0	0.628	0.628
24	Cr	chromium	8.5	1.06	1.120
25	Mn	manganese	6.0		0.196
26	Fe	iron	4.0	0.608	0.49
27	Co	cobalt	5.0	1.043	0.7
28	Ni	nickel	4.0	0.638	0.7
29	Cu	copper	3.0	0.369	0.874
30	Zn	zinc	2.5		0.412
31	Ga	gallium	1.5		0.06
32	Ge	germanium	6.0
33	As	arsenic	3.5
34	Se	selenium	2.0		0.736
37	Rb	rubidium	0.5		0.216
38	Sr	strontium	0.5
39	Y	yttrium			0.589
40	Zr	zirconium	5.0	0.903	0.650
41	Nb	niobium	6.0	1.32	0.736
42	Mo	molybdenum	5.5	1.53	1.5
44	Ru	ruthenium	6.5		2.16
45	Rh	rhodium	6.0	1.246	1.1
46	Pd	palladium	5.0	0.461	0.0373
47	Ag	silver	2.5	0.251	0.0245
48	Cd	cadmium	2.0		0.203
49	In	indium	1.0		0.00883
50	Sn	tin	1.5		0.0051
51	Sb	antimony	3.0		0.294
52	Te	tellurium	2.0		0.018
55	Cs	caesium	0.2		0.00014
56	Ba	barium	1.0
57	La	lanthanum	2.5	0.491	0.363
58	Ce	cerium	2.5	0.27	0.412
59	Pr	praseodymium		0.4	0.481
60	Nd	neodymium		0.343	0.265
62	Sm	samarium		0.412	0.441
63	Eu	europium		0.167
64	Gd	gadolinium		0.57
65	Tb	terbium		0.863	0.677
66	Dy	dysprosium		0.54	0.500
67	Ho	holmium		0.481	0.746
68	Er	erbium		0.589	0.814
69	Tm	thulium		0.52	0.471
70	Yb	ytterbium		0.206	0.343
71	Lu	lutetium		1.16	0.893
72	Hf	hafnium	5.5	1.76	1.7
73	Ta	tantalum	6.5	0.873	0.8
74	W	tungsten	7.5	3.43	2.57
75	Re	rhenium	7.0	2.45	1.32
76	Os	osmium	7.0		3.92
77	Ir	iridium		1.76	1.67
78	Pt	platinum	3.5	0.549	0.392
79	Au	gold	2.5	0.216	0.245
81	Tl	thallium	1.0		0.0264
82	Pb	lead	1.5		0.0383
83	Bi	bismuth	2.5		0.0942
90	Th	thorium	3.0	0.35	0.4
92	U	uranium	6.0	1.96	2.4

[edit] References

As quoted at http://www.webelements.com/ from this source:

G.V. Samsonov (Ed.) in Handbook of the physicochemical properties of the elements, IFI-Plenum, New York, USA, 1968.