How were elements categorized in the 1800s
Their physical properties and relative atomic mass.
Why was Newland's Law of Octaves wrong?
The pattern broke down on the third row. And he didn't leave gaps . He mixed non-metals with metals and his groups contained elements with different properties.
Why was Dmitri Mendeleev's work more accepted?
He put things in order of atomic mass and left gaps which would predict later discovered elements.
Why wasn't the periodic table fully recognised until later on?
Other scientists thought it was just be a bit of fun.
What is the modern periodic table based upon?
Electronic structure or atomic mass.
What happens as you go down Group 1?
They become more reactive and have lower boiling and melting points.
What are the six alkalis called?
Lithium, Sodium, Potassium, Rubidium, Caesium and Francium.
What sort of compunds do alkalis make when the bond with non-metals?
What gas do alkalis make when they react with water?
How can you test for hydrogen?
Squeaky pop test. Light a splint and put it towards the test tube.
What happens as you go down Group 7?
They're less reactive, higher melting point, higher boiling point.
What's the colour of fluorine gas?
What's the colour of chlorine gas?
what's the colour of Bromine?
What's the colour of Iodine?
Dark grey crystalline solid or a Purple vapour.
What bonds do they make with metals?
What will more reactive halogens do to lesser reactive halogens?
Displace them from the compound.
What are the properties of Transition Metals?
They're good conductors of heat and electricity. They're dense, strong and shiny. High melting points.
What does hard water make?
Scum and scale
What is scum?
What is scale?
When hard water is heated.
I made this. Much processes, Very chemistry.