Arsenic (As) VS Antimony (Sb)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Arsenic (As) is an element in the metalloids category with an atomic number of 33. Antimony (Sb) is an element in the metalloids category with an atomic number of 51.
Antimony (Sb) is 1.2x denser than Arsenic (As). Furthermore, Arsenic (As) melts at a significantly higher temperature than Antimony (Sb) (a difference of 186.2 Kelvin).
Where do the names come from?
Arsenic (As) Naming History
The name Arsenic is thought to come from 'arsenikon', the Greek name for the yellow pigment orpiment.
Antimony (Sb) Naming History
The name Antimony derives from the Greek ''anti - monos'', meaning not alone
Related Comparisons
Compare
Arsenic (As)
Antimony (Sb)
Category
Metalloids
Metalloids
Atomic Number
33
51
Symbol
As
Sb
Atomic Mass
74.922 u
121.76 u
Group
15
15
Period
4
5
Block
p-block
p-block
Standard State (at 20°C)
solid
solid
Density
5.727 g/cm³
6.697 g/cm³
Melting Point (°C)
Sublimes at 616°C
630.628°C
Melting Point (°F)
1141°F
1167.13°F
Melting Point (K)
1090 (sublimes) K
903.78 K
Boiling Point (°C)
Sublimes at 616°C
1587°C
Boiling Point (°F)
1141°F
2889°F
Boiling Point (K)
887 (sublimes) K
1860 K
Year Discovered:
1250
c. 1450
CAS Number
7440-38-2
7440-36-0
Origin of Name:
The name is thought to come from 'arsenikon', the Greek name for the yellow pigment orpiment.
The name derives from the Greek ''anti - monos'', meaning not alone