Periodic Table- group 7

Question 1

what is group 7 called?

Answer 1

the HALOGENS

Question 2

the higher up group 7 an element is, the ____ reactive it is

Answer 2

MORE

Question 3

reactivity increases/decreases going down group 7

Answer 3

DECREASES

Question 4

why does reactivity decrease going down group 7?

Answer 4

• a halogen atom only needs to gain 1 electron to form a 1- ion with a stable electronic structure
• the easier it is for a halogen atom to attract an electron, the more reactive the halogen will be.
• it gets harder to attract the extra electron to fill the outer shell when it’s further away from the nucleus (the atomic radius is larger)

Question 5

what happens in displacement reactions

Answer 5

MORE reactive halogens will displace LESS reactive ones

Question 6

loss of electrons=

displacement reactions

Answer 6

oxidation

Question 7

gaining electrons=

displacement reactions

Answer 7

reduction

Question 8

what does OILRIG stand for

Answer 8

Oxidation Is Loss

Reduction Is Gain

Question 9

what happens as the atomic number of the halogens increases?

Answer 9

the elements have a darker colour and higher boiling point.

Question 10

what is chlorine at room temperature?

Answer 10

a fairly reactive, poisonous, GREEN GAS

Question 11

what is bromine at room temperature?

Answer 11

a poisonous, red-brown liquid, which gives off an orange vapour at room temperature

Question 12

what is iodine at room temperature?

Answer 12

a dark grey crystalline solid which gives off a purple vapour when heated.

Question 13

how can you predict the properties of other halogens?

Answer 13

• you can see that boiling point increases down the group, and the colours of the halogens get darker, so you could predict that astatine would be a dark-coloured solid at room temperature
• sure enough, astatine is a black solid with a melting point of around 300°C