Which substances are the hardest

Periodic table   >>   Terms, tables
   

 
The hardest chemical elements
 
position
Surname
Mohs hardness
1
Carbon (diamond
10,0
2
Boron (beta-rhombohedral)
9,5
3
chrome
8,5
4
tungsten
7,5
5
rhenium
7,0
6
osmium
7,0
7
iridium
6,5
8
Silicon
6,5
9
Ruthenium
6,5
10
Tantalum
6,5
 
 
The softest chemical elements
 
position
Surname
Mohs hardness
1
Cesium
 0,2
2
Rubidium
 0,3
3
potassium
 0,4
4
sodium
 0,5
5
lithium
 0,6
6
graphite
 0,5 - 1,0
7
Indium
 1,2
8
lead
 1,5


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