Group 7 Halogens

Question 1

What are the elements in group 7 called and what are they?

Answer 1

They are called halogens and they are 
Chlorine
Bromine
Iodine
Fluorine
Astatine

Question 2

What are the properties and uses of the halogens?

Answer 2

Chlorine is a green gas and is used for sterilizing water

Bromine is a orange liquid and is used to make plastics

Iodine is a grey solid and is used for sterilizing wounds

Question 3

How many electrons do the halogens have in their outer shell and why?

Answer 3

The halogens have 7 electrons in their outer shell this is because they are in group 7 the group determines the number of electrons in the halogens outer shell

Question 4

What happens to reactivity as you go down in group7?

Answer 4

Decreases as it gets harder to attract the extra electron to fill the outer shell when its further away from the nucleus

Question 5

How do you test for chlorine?

Answer 5

By holding a piece of damp litmus paper in chlorine gas the chlorine will bleach the litmus paper turning it white.

Question 6

What happens when halogens react with metals?

Answer 6

Form metal halides

Question 7

What happens when you react halogens with hydrogen?

Answer 7

Halogens become hydrogen halides

Question 8

What is a displacement reaction?

Answer 8

Is where a more reactive element takes over a less reactive from a compound

Question 9

What are noble gases used for?

Answer 9

Argon used in light bulbs:it’s non flammable

Helium used in balloons:it’s non flammable and lower density

Question 10

Why do noble gases don’t react with anything?

Answer 10

Because it has a full outer electron shell

Question 11

What are patterns in properties of the noble gases?

Answer 11

High melting and boiling point and density increase as you go down group 0

Question 12

What are properties of foehn 1 metals?

Answer 12

Low melting and boiling point

Soft

Question 13

What happens to reactivity as you go down group 1?

Answer 13

The alkali metals get more reactive the outer electron is more easily lost because its furthest from nucleus so less strongly attracted to nucleus and less energy is needed to remove it.

Question 14

What do you observe when sodium and potassium and lithium react with water?

Answer 14

Lithium:move around surface fizzing vigorously

Sodium and potassium:see lilac flame bubbling across the surface of the water