Chlorine (Cl) VS Bromine (Br)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Chlorine (Cl) is an element in the halogens category with an atomic number of 17. Bromine (Br) is an element in the halogens category with an atomic number of 35.
Chlorine (Cl) is 1.0x denser than Bromine (Br). However, Bromine (Br) melts at a higher temperature than Chlorine (Cl) (a difference of 94.2 Kelvin).
Where do the names come from?
Cl Chlorine (Cl) Naming History
The name Chlorine is derived from the Greek ''chloros'', meaning greenish yellow.
Br Bromine (Br) Naming History
The name Bromine comes from the Greek ''bromos'' meaning stench.
Related Comparisons
Compare
Chlorine (Cl)
Bromine (Br)
Category
Halogens
Halogens
Atomic Number
17
35
Symbol
Cl
Br
Atomic Mass
35.45 u
79.904 u
Group
17
17
Period
3
4
Block
p-block
p-block
Standard State (at 20°C)
gas
liquid
Density
3.214 g/L g/cm³
3.12 g/cm³
Melting Point (°C)
−101.5°C
−7.2°C
Melting Point (°F)
−150.7°F
19°F
Melting Point (K)
171.6 K
265.8 K
Boiling Point (°C)
−34.04°C
58.8°C
Boiling Point (°F)
−29.27°F
137.8°F
Boiling Point (K)
239.11 K
332 K
Year Discovered:
1774
1826
CAS Number
7782-50-5
7726-95-6
Origin of Name:
The name is derived from the Greek ''chloros'', meaning greenish yellow.
The name comes from the Greek ''bromos'' meaning stench.