Periodic table Flashcards
When you cut an alkali metal, a layer of tarnish forms. What is this called
This is oxidation.
How does the melting point of the alkali metals change as you go down?
It decreases
What happens to the reactivity of alkali metals as you go down?
Increase
What is the name for group 7
Halogens
What is formed when a halogen reacts with a metal
It forms a halide salt.
What happens to the name of a halogen once it it becomes an ion?
It changes from -ine to -ide
What are the appearances of Chlorine, Bromine and Iodine at room temperature?
Cl - Green gas
Br - Brown liquid
I - Purple/grey solid
What are the properties of Halogen gases?
- Non-metals
- Diatomic
- Toxic
- Corrosive
- Brittle when solid
- Low mp/bp
- Poor conductors of electricity and heat
- Coloured vapours
What is the common use for all the halogens?
As disinfectancs/bleaches as they can kill microorganisms and remove stains.
What is the test for chlorine?
Damp blue litmus paper will turn red and bleach white in the presence of chlorine gas.
What is another name for the group 0 elements?
Group 8 / Noble gases
What are the properties of the noble gases?
Colourless
- Have very low m.p/b.p
- Poor conductrors of heat and electricity
- Inert/unreactive
