Group 7 (Halogens)

Question 1

How many electrons do they have on their outer-most shell

Answer 1

They have 7 electrons on their outer-most shell

Question 2

What happens in a reaction with group 7 elements

Answer 2

They gain an electron to complete their outer shell

Question 3

What happens to their reactivity as you go up the order

Answer 3

It increases

Question 4

Why does their reactivity increase as you go up the order

Answer 4

As there are less shells meaning they are closer to the nucleus so there is a stronger bond between the nucleus and outer-most shell making it easier to gain an electron

Question 5

KBr+Cl2==>KCl2+Br

Answer 5

In displacement reactions the more reactive element will displace the less reactive element

Question 6

which element in group 7 is radioactive

Answer 6

Astatine

Question 7

What halogen is a gas at room temperature, yellow, with yellow vapour, yellow aqueous solution

Answer 7

fluorine

Question 8

What halogen is a gas at room temperature, green, with green vapour, green aqueous solution

Answer 8

chlorine

Question 9

What halogen is a liquid at room temperature, red/brown, orange/brown vapour, orange aqueous solution

Answer 9

bromine

Question 10

What halogen is a solid at room temperature, grey, purple vapour, brown aqueous solution

Answer 10

iodine

Question 11

From the descriptions of the other halogens you should be able to determine the colour of astatine the next halogen in the order

Answer 11

Astatine is black