Chlorine (Cl) VS Fluorine (F)
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. Fluorine (F) is an element in the halogens category with an atomic number of 9.
Chlorine (Cl) is 1.9x denser than Fluorine (F). Furthermore, Chlorine (Cl) melts at a significantly higher temperature than Fluorine (F) (a difference of 118.1 Kelvin).
Where do the names come from?
Cl Chlorine (Cl) Naming History
The name Chlorine is derived from the Greek ''chloros'', meaning greenish yellow.
F Fluorine (F) Naming History
The name Fluorine is derived form the Latin ''fluere'', meaning to flow
Related Comparisons
Compare
Chlorine (Cl)
Fluorine (F)
Category
Halogens
Halogens
Atomic Number
17
9
Symbol
Cl
F
Atomic Mass
35.45 u
18.998 u
Group
17
17
Period
3
2
Block
p-block
p-block
Standard State (at 20°C)
gas
gas
Density
3.214 g/L g/cm³
1.696 g/L g/cm³
Melting Point (°C)
−101.5°C
−219.67°C
Melting Point (°F)
−150.7°F
−363.41°F
Melting Point (K)
171.6 K
53.53 K
Boiling Point (°C)
−34.04°C
−188.11°C
Boiling Point (°F)
−29.27°F
−306.6°F
Boiling Point (K)
239.11 K
85.03 K
Year Discovered:
1774
1886
CAS Number
7782-50-5
7782-41-4
Origin of Name:
The name is derived from the Greek ''chloros'', meaning greenish yellow.
The name is derived form the Latin ''fluere'', meaning to flow