Krypton (Kr) VS Xenon (Xe)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Krypton (Kr) is an element in the noble gases category with an atomic number of 36. Xenon (Xe) is an element in the noble gases category with an atomic number of 54.
Xenon (Xe) is 1.6x denser than Krypton (Kr). However, Xenon (Xe) melts at a higher temperature than Krypton (Kr) (a difference of 45.6 Kelvin).
Where do the names come from?
Kr Krypton (Kr) Naming History
The name Krypton is derived from the Greek ''kryptos'', meaning hidden.
Xe Xenon (Xe) Naming History
The name Xenon is derived from the Greek ''xenos'' meaning stranger.
Related Comparisons
Compare
Krypton (Kr)
Xenon (Xe)
Category
Noble Gases
Noble Gases
Atomic Number
36
54
Symbol
Kr
Xe
Atomic Mass
83.798 u
131.293 u
Group
18
18
Period
4
5
Block
p-block
p-block
Standard State (at 20°C)
gas
gas
Density
3.749 g/L g/cm³
5.894 g/L g/cm³
Melting Point (°C)
−157.37°C
−111.75°C
Melting Point (°F)
−251.27°F
−169.15°F
Melting Point (K)
115.79 K
161.4 K
Boiling Point (°C)
−153.415°C
−108.099°C
Boiling Point (°F)
−244.147°F
−162.578°F
Boiling Point (K)
119.93 K
165.03 K
Year Discovered:
1898
1898
CAS Number
7439-90-9
7440-63-3
Origin of Name:
The name is derived from the Greek ''kryptos'', meaning hidden.
The name is derived from the Greek ''xenos'' meaning stranger.