Rn

Radon · element 86

Noble Gas · Gas at room temperature

Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.

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This is only an illustration, not radon itself. Radon is said to glow red in discharge tubes, although it practically is never used for this, due to its strong radioactivity.
This is only an illustration, not radon itself. Radon is said to glow red in discharge tubes, although it practically is never used for this, due to its strong radioactivity. - Chemical ELements A Virtual Museum, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0> source: https://images-of-elements.com/radon.php

Key facts

Atomic mass
222 u
how heavy one atom is
Phase (room temp.)
Gas
Density
9.73 g/L
how tightly packed it is
Melting point
202 K (-71 °C)
when solid turns to liquid
Boiling point
211.5 K (-62 °C)
when liquid turns to gas
Period
6
its row in the periodic table
Group
18
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
2.2
how strongly it pulls electrons
Electron configuration
[Xe] 4f14 5d10 6s2 6p6
where its electrons live
Shells
2 · 8 · 18 · 32 · 18 · 8
electrons in each layer, inside to out
Discovered by
Friedrich Ernst Dorn
who found it
Appearance
colorless gas, occasionally glows green or red in discharge tubes
what it looks like

Source: Wikipedia

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