Periodic Table Development Flashcards
1
Q
What were they first arranged in ?
A
Atomic mass
2
Q
Who first overcame problems in the periodic table ?
A
Dmitri Mendeleev in 1869
3
Q
What did Dmitri Mendeleev do ?
A
Put in order of atomic mass alongside elements with similar properties
4
Q
What did Mendeleev do within the table ?
A
Leave gaps for undiscovered elements
