The Periodic Table Flashcards
Who invented the periodic table:
Dmitri Mendeleev
What is special about group 0?
They are all very unreactive gases
What is special about group 1:
The alkali metals all form alkaline compounds, and the further down the element, the more reactive it is. They react with water and air. They are similar to the transition metals
What is special about group 7:
The halogens all form salts, and the further up the element, the more reactive it is. They react with iron.
How is the periodic table ordered:
By atomic number (number of protons)
What is the atomic number:
The number of protons in an atom
What is the mass number:
The number of protons and neutrons
In what order was the full atom discovered
- Indestructible tiny things
- Compounds
- Protons
- Orbiting electrons
- Orbit jumps
- Neutron
What do elements of the same group have in common:
The same amount of electrons in the outer shell
Why is group 0 unreactive:
Because they have a stable outer shell
Why is group 7 and 1 reactive:
They have a very unstable outer shell - one away
What is special about transition metals:
They form colourful compounds and they make good catalysts
How did Mendeleev solve some problems with his periodic table:
He left gaps to predict other elements and moved some elements if they fit better elsewhere
How was the periodic table organised before Mendeleev:
By relative atomic mass (not structure/properties)
Are most elements metals or non-metals:
Metals
