Periodic Table History Flashcards
1
Q
Who created the table of octaves and when
A
John Newlands 1864
2
Q
What did John Newlands do to order the periodic table
A
Ordered the 60 known elements on atomic masses elements with similar properties appear every 8 places
3
Q
Problems with John Newlands table
A
Atomic weights weren’t accurate
Two elements were in the same box when convenient
Elements in octaves had very different properties
no space for new elements
4
Q
What did Dmitri Mendeleev do to order the elements
A
Recalculated atomic weights
Ordered elements according to atomic weight and properties
He left gaps for elements yet to be discovered
5
Q
How is the modern periodic table ordered
A
By atomic number not weight
