C2 The Periodic Table Flashcards
Who arranged the elements in order of their atomic weights?
John Dalton
Who noticed that elements with similiar properties occurred at regular intervals?
Alexandre-Emile Beguyer de Chancoutrois
Who noticed that in the current periodic table at the time, elements with similar properties occurred in intervals of 8?
John Newlands
Who swapped the order of the periodic table around and left gaps for undiscovered elements?
Dimitri Mendeleev
What is the name of group 1?
The Alkali metals
What is the name of group 7?
The Halogens
What is the name of group 0?
The Noble gases
Vertical columns are called…
Groups
Elements in a group…
React similarly, have similiar chemical properties, have similar chemical structure
Alkali metals…
React rapidly with water, producing an alkaline aolution and hydrogen gas (the metals become more reactive as you go down the group)
Halogens…
Exist as diatomic molecules - this means that they always travel in pairs. Halogens become more reactive as you go down a group.
Noble gases…
Noble gases are very unreactive and exist as individual atoms - monatomic.
Transistion metals…
Are found between group 2 and 3, they are usually wuite heavy and brightly coloured, they are good conductors of heat and electricity and they have high melting points
What are electrons called when they are in the outer shell?
Valance electrons
If an element is in group 3 how many valance electrons does it have?
3
