Periodic Table Flashcards
How did Newlands organise the elements
In groups of seven with no spaces because they had similar properties
Why didn’t it go well?
Non metals and metals were mixed up
Different properties were in the same group
He didn’t leave any gaps for undiscovered
How did Mendeleev organise the periodic table?
They put them in order of atomic mass but left gaps in order to make it work
Why did people like it?
Because it could predict future elements to be discovered and that was pretty useful, and it proved it was right.
What is group 1 known as?
The alkali metals
As you go down the alkali metals, what happens?
They get more reactive, and have lower boiling points
What are the properties of alkali metals?
They have a low density
One outer electron
What kind of compounds do alkali metals form
They lose an electron to form an ionic compound
What happens when you put an alkali metal in water?
The first 3 produce hydrogen gas, so they will squeaky pop!
What is group 7 known as?
Halogens!
What happens as you go down the halogens?
The boiling point increases
They get less reactive
What are the colours of the different halogens
Chlorine- green gas
Bromine- purple liquid
Fluorine- yellow gas
Iodine- silver solid
- purple gasHow many do halogens travel around in?
Pairs!
What type of bonds do halogens form?
They form ionic bonds with metals
Which halogens displace which?
More reactive displace less reactive
