Kr
Krypton · element 36
Noble Gas · Gas at room temperature
Krypton (from Greek:κρυπτός kryptos "the hidden one") is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquefied air, and is often used with other rare gases in fluorescent lamps.
Key facts
Atomic mass
83.7982 u
how heavy one atom is
Phase (room temp.)
Gas
Density
3.749 g/L
how tightly packed it is
Melting point
115.78 K (-157 °C)
when solid turns to liquid
Boiling point
119.93 K (-153 °C)
when liquid turns to gas
Period
4
its row in the periodic table
Group
18
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
3
how strongly it pulls electrons
Electron configuration
[Ar] 3d10 4s2 4p6
where its electrons live
Shells
2 · 8 · 18 · 8
electrons in each layer, inside to out
Discovered by
William Ramsay
who found it
Appearance
colorless gas, exhibiting a whitish glow in a high electric field
what it looks like
Source: Wikipedia