A Visual Encyclopedia of the Periodic Table

195

Noble Gases

P

u

re

a

rg

on

in

a

gl

as

s^ s

phe

re

Argon

Ar

18

Uses

Argon is the third most abundant gas in the

atmosphere, after nitrogen and oxygen. It

undergoes no reactions with any other element,

and was named after the Greek word argos,

meaning “idle”. Argon does not conduct heat

well so it is put in double-glazed windows,

and in diving suits during cold, deep dives.

Its lack of reactivity is useful. Argon is used in

museum displays to protect delicate exhibits.

It also stops metals reacting during hot welding.

This element can also be useful in the production

of titanium.

Argon-filled display

Double-glazedwindow

The space

between the

glass panes

is filled with

argon to

slow the loss

of heat.

Argon in this flame

prevents metals from

reacting with oxygen

Some diving suits

are inflated with

argon to retain

heat in cold water.

This sample of argon

is trapped in a glass

sphere, and gives off

a pale purple colour

when electrified.

A

rg

on

• fi

lle

d^

su

it

18 18 22

State: Gas

Discovery: 1894

Metal (^) w
elding
The Magna Carta, a historical document, is stored
in argon, which forces out oxygen and water vapour
that would damage the parchment.
Forms
194-195_Argon_Neon.indd 195 02/12/16 6:54 pm