Group 0 (Noble gases) & Transition elements

Question 1

Properties of noble gases

Answer 1

• non metals
• monatomic
• colourless gases @ room temp
• low mp & bp
• insoluble in water
• unreactive

Question 2

Why are noble gases unreactive?

Answer 2

• full electronic structures
• do not lose, gain or share electrons
• rarely react to form compounds

Question 3

Uses of noble gases

Answer 3

Helium: filling weather/ad balloons
Argon: fill tungsten bulbs (inert atmosphere prevents oxidation of filament)
Neon: lights
Xenon: Vehicle headlamps
Argon: inert atmoshphere for certain process ie. welding stainless steel

Question 4

Transition elements

Answer 4

• block of metals btwn Groups II and III

- aka transition metals

Question 5

Properties of transition metals

Answer 5

• high mp and bp
• high densities
• variable oxidation states
• form coloured compounds
• t. metals and their compounds are good catalysts

Question 6

Form coloured compounds

Answer 6

• Aqueous iron (III) chloride: Yellow

- Aq iron (II) chloride: Green

Question 7

Good catalysts

Answer 7

• iron (manufacture of ammonia)
• nickel (manufacture of margarine from veg oil)
• used in many industrial processes