Halogens and Transition metals

Question 1

Group 7

Answer 1

The Halogens - react in a similar way
7 electrons

in outer shell

Question 2

Reactivity - 4 bullet points

Answer 2

• reactivity decreases down the group
• there are MORE ELECTRON SHELLS/ outer electron shell is FURTHER AWAY FROM THE NUCLEUS
• the attraction between the nucleus and the outer electron shell is WEAKER
• so electron is LESS EASILY GAINED down the group

Question 3

Chlorine colour, state at room temp, colour in water & oil

Answer 3

pale Green
Gas
Colourless
Colourless

Question 4

Bromine colour, state at room temp, colour in water & oil

Answer 4

brown
liquid
orange-brown
orange

Question 5

Iodine colour, state at room temp, colour in water & oil

Answer 5

grey-black
solid
water: brown
oil: purple

Question 6

physical properties of group VII:

colour, state at room temp, colour in water & oil, density

Answer 6

down the group
colour: darker 
state: increase in melting point
colour in H2O & oil: darker
density: decreases

Question 7

predict astatine

Answer 7

black & solid

Question 8

What are halides?

Answer 8

The ions of halogen atoms when they gain an electron

Question 9

What colour are all halide salts?

Answer 9

All of the halide salts are colourless

Question 10

Displacement reaction (2)

Answer 10

• when a more reactive element replaces

- a less reactive element in a COMPOUND

Question 11

state 2 uses of argon

Answer 11

• inert atmosphere for welding
• electric light bulbs
• advertising signs

Question 12

state use of helium

Answer 12

• filling balloons = less dense than air and does not burn

Question 13

state common use of neon, argon and xenon

Answer 13

advertising signs

Question 14

give 3 different properties of transition metals which are not typical of other metals (3)

Answer 14

(good) catalysts;
variable oxidation numbers;
form coloured compounds / coloured ions;