The noble gases

Question 1

What are the elements in group 0 called?

Answer 1

noble gases

Question 2

chemical properties of noble gases

Answer 2

chemically inert (unreactive)

atoms have full outer shell of electrons

no tendency to lose, gain, or share electrons

Question 3

list the group 0 non-metals

Answer 3

helium
neon
argon
krypton
xenon
radon

Question 4

typical use of helium and reasons why

Answer 4

lifting gas in party/weather balloons and airships

• low density
• inertness
• helium is less dense than air so the balloons/airships rise
• non-flammable so does not ignite

Question 5

typical use for argon, krypton and xenon and reasons why

Answer 5

filling gas in filament lamps

-inertness

• metal filament becomes hot enough to glow
• inert gases stop it burning away

Question 6

2 typical uses for argon and reasons why

excluding filament lamps

Answer 6

shield gas during welding

-inertness

• argon is denser than air so it keeps air away from the metal
• inert so the metal does not oxidise

added to the space above wine in a wine barrel

-stops oxygen reacting with wine

Question 7

typical use for neon and reasons why

Answer 7

long lasting illuminated signs

-makes red-orange light when electricity is passed through it

Question 8

typical use for krypton and reasons why

excluding filament lamps

Answer 8

photography lighting

-makes a bright white light when electricity is passes through it

Question 9

Describe the trend in density down group 0

Answer 9

increases

Question 10

Describe the trend in boiling/melting point down group 0

Answer 10

increases

still in the negative hundreds

Question 11

Describe the trend in density down group 0

Answer 11

increases
(atoms get bigger)

(still extremely low)

Question 12

The density of air is 1.225 kg/m3

Explain why helium and neon can be used as lifting gases but argon and krypton cannot

Answer 12

densities of helium and neon are less than the density of air
densities of argon and krypton are greater than the density of air

Question 13

Give two reasons why argon may be used in some fire extinguishing systems

Answer 13

inert/non flammable

denser than air so sinks and excludes air/will be able to get past air to reach the fire and put it out

Question 14

Explain, in terms of its electronic configuration, why helium is inert

Answer 14

electronic configuration is 2

outer shell is full

no tendency to lose/gain/share electrons

Question 15

Demonstrate the trend in the electronic configurations of the noble gases

Answer 15

2
8,2
8,8,2

…and so on