History of the Periodic Table Flashcards
0
Q
Who arranged the table in 1864?
A
John Newlands
1
Q
How were elements arranged in the periodic table before the 20th century?
A
Relative atomic mass
2
Q
What was special about every eight element and what was this system called?
A
- They had similar properties
- Newland’s octaves
3
Q
When did Newland’s pattern break down?
A
On the third row
4
Q
Why was Newland’s work ignored? (3)
A
- His groups contained elements that didn’t have similar properties
- He mixed up metals and non-metals
- He didn’t leave any gaps for undiscovered elements
5
Q
Who tried to arrange the periodic table in 1869?
A
Dmitri Mendeleev
6
Q
How did Mendeleev organise the periodic table?
A
- By relative atomic mass
- Kept elements with similar properties in the same columns (groups)
- Left gaps
