The periodic table/metals + non-metals - chemistry Flashcards
What is a catalyst?
substances that increase the rate of a chemical reaction without being used up themselves
What are the 7 physical properties of metals
They are good conductors of heat and electricity
They are malleable (they can bend without being broken)
They are shiny
They are sonorous
They have a high density
They have high melting and boiling points
They have strong metallic bonding
What are the 5 physical properties of non-metals?
They are dull in colour
They have low melting and boiling points
They are not good conductors of heat and electricity
They are brittle
They have a lower density
What is the reactivity series of metals?
They increase as they go down the group
What are the 2 physical properties of transition metals?
They can gain more than one ion
They are great catalysts
How was the periodic table arranged initially before Mendeleev?
it was arranged in terms of atomic weight
What did Mendeleev do?
He put gaps in the periodic table for unknown elements
Once he found the elements, what made him realise that atomic weight is sometimes inaccurate?
isotopes as the different amount of neutrons can change the atomic weight
