The Periodic Table - Topic 1 Flashcards
What did Dobereiner do?
He arranged elements into groups of 3
What were Dobereiner’s groups based on?
Elements with similar properties were grouped together.
How did Newlands arrange the elements?
In order of increasing atomic mass
Why was Newlands law called the law of octaves?
Every 8th element had similar properties to the first
What was the problem with Newlands version of the Periodic table?
It only worked for some elements.
How did Mendeleev improve the Periodic Table?
He left gaps for elements that had not been discovered yet
How did Mendeleev arrange the elements?
In order of increasing atomic mass AND by chemical properties.
How are elements arranged in the periodic table?
In order of atomic number (lowest to highest).
What does the group an element is in on the Periodic Table tell us about its structure?
Number of electrons in the outer shell.
What are the rows of the periodic table called?
Periods
What does the period an element is in on the Periodic Table tell us about its structure?
Number of electron shells an element has
Where are non-metals found in the periodic table?
Right
Give 4 properties of metals.
1) High melting point,
2) Good thermal and electrical conductors,
3) Ductile,
4) Malleable
Give 3 properties of non-metals.
1) Low melting point,
2) Poor thermal and electrical conductors,
3) Brittle
