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THE NOBLE GASES

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Group 0 the noble gases

Coming after Group 7, you might expect these to be called

Group 8 and in some books they are.

Group 0 is a better name thoughbecause thats what they do!

H

Li

Na

KRb

Cs

Fr

Be

Sc Ti

Mg

V Cr Mn Fe Co Ni Cu Zn Ga Ge Se BrCa KrY Zr Nb Mo Tc Ru Pd Ag Cd In Sn SbSr TeRh

Ba Hf Ta W Re Os Ir Au Hg Tl Pb Bi PoLa AtPt

Ra Rf Db Sg Bh Hs Mt ? ?Ac ?

Al P

N O

S Cl

F Ne

Ar

Rn

I

Si

Xe

He

B C

As

Kr

Ne

Ar

Rn

Xe

He

Gp 0

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Electron Structure and Reactivity

All the elements in this group

have fully occupied outer shells.

They are the least chemically

reactive elements. The stable

arrangement means that thenoble gases do not form

chemical bonds with each other

or other elements.

They are monatomic which

means they exist as individual

atoms.

Ar

Ne

He 2

2,8

2,8,8

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Uses of Noble Gases

You might think that a group of

elements that have almost no

reactions would have few uses.

You would be wrong! They have

many uses, mostly based upon theirability to prevent other (undesirable)

reactions taking place.

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Uses of Helium

- Balloons (big and small).

- Protective gas for growing siliconcrystals in silicon chip manufacture.

-

- Rare documents preservation (i.e.US Declaration of Independence).-- Pressurizing agent for liquid fuel

rockets (inert so won't react).

- Coolant for the super-conductorsused in body scanners.

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Uses of Neon

- Fluorescent lights

and neon signs.

- TV tubes.- Neon lasers.

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Uses of Argon

- Used to fill light bulbs because the

filament will not react with argon.

- Used as an inert gas shield for arc

welding and cutting especially metals

easily damaged by oxygen such asaluminium & stainless steel.

- Argon is involved in dating the ages

of rocks by potassium-argon dating.

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Ne

Ar

He

Match the gas with the use

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Patterns: Density!

- There can be few chemical patterns for a group as

unreactive as this.

- There are still trends in physical properties

0.17

0.84

1.66

3.46

5.45

8.9

0

Density g/dm-

3

Rn

Xe

Kr

Ar

Ne

He

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- There are also trends in boiling point.

- Can you predict the B.Pts of Kr Xe and Rn?

-269

-246

-186

-152

-108

-62

-300 -200 -100 0

Boiling Point

C

Rn

Xe

Kr

Ar

Ne

He

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Which isNOT

a true statement about thenoble gases?

A. They contain shells that are full or empty

B. They are monatomic gasesC. They are un-reactive.

D. They are lighter than air

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Which gas is used in normal light bulbs?

A. Helium

B. Neon

C. ArgonD. Krypton

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Which gas is used in airships?

A. Helium

B. NeonC. Argon

D. Krypton

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Which gas is used in red fluorescent lights?

A. Helium

B. NeonC. Argon

D. Krypton

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Which gas is used to provide a shield of

inert gas during arc welding of metals like

aluminium?

A. Helium

B. Neon

C. Argon

D. Krypton