Bromine (Br) VS Iodine (I)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Bromine (Br) is an element in the halogens category with an atomic number of 35. Iodine (I) is an element in the halogens category with an atomic number of 53.
Iodine (I) is 1.6x denser than Bromine (Br). However, Iodine (I) melts at a higher temperature than Bromine (Br) (a difference of 121.1 Kelvin).
Where do the names come from?
Br Bromine (Br) Naming History
The name Bromine comes from the Greek ''bromos'' meaning stench.
I Iodine (I) Naming History
The name Iodine is derived from the Greek ''iodes'' meaning violet.
Related Comparisons
Compare
Bromine (Br)
Iodine (I)
Category
Halogens
Halogens
Atomic Number
35
53
Symbol
Br
I
Atomic Mass
79.904 u
126.904 u
Group
17
17
Period
4
5
Block
p-block
p-block
Standard State (at 20°C)
liquid
solid
Density
3.12 g/cm³
4.933 g/cm³
Melting Point (°C)
−7.2°C
113.7°C
Melting Point (°F)
19°F
236.7°F
Melting Point (K)
265.8 K
386.85 K
Boiling Point (°C)
58.8°C
184.4°C
Boiling Point (°F)
137.8°F
363.9°F
Boiling Point (K)
332 K
457.4 K
Year Discovered:
1826
1811
CAS Number
7726-95-6
7553-56-2
Origin of Name:
The name comes from the Greek ''bromos'' meaning stench.
The name is derived from the Greek ''iodes'' meaning violet.