4.2 Groups I and VII Flashcards
Give the name for group 1?
Alkali
Name all the elements in grp 1? (symbol or full)
Li, Na, K, Rb, Cs
What are the physical properties of grp 1?
- Malleable
- Low melting/boiling point
- Soft
- Ductile
- Conduct electricity and heat
What happens as you go down the group in terms of shells?
Increase of shells as you go down
What happens to attraction between nucleus as shells increase?
The attraction will weaken
How does this affect the outer electrons as there is a weaker attraction?
Outer electrons are more easily lost
Name all the halogens?
Fluorine
Chlorine
Bromine
Iodine
Astatine
Give the properties of fluorine?
Found in period 2
It’s pale yellow in colour
It’s a toxic gas
It’s the most reactive halogen
Can prevent tooth decay
Give the properties of chlorine?
Found in period 3
Pale green coloured
Poisonous gas
Very soluble in water
It can combine with most elements
Used in the digestive system (stomach)
Give the properties of bromine?
Found in period 4
Brown/Black in colour
It is a non metal liquid at room temperature
Harmful to human skin
Less reactive than chlorine
Give the properties of iodine?
Found in period 5
Dark grey coloured
Solid at room temp
Sublimes just above room temp forming a purple gas
Used in the test for starch and used in photography
Give the properties of astatine?
Found in period 6
Black solid at room temp
Short lived radioactive element
When a Halogen reacts with a metal what will happen to both of them?
Metal is Oxidised
Halogen is Reduced
As you go down group 7 and 1 what happens to the atomic radius?
Increases
As you go down group 7 and 1 what happens to the nuclear attraction?
Decreases
