The Periodic Table Flashcards
(6 cards)
1
Q
How are elements in the periodic table arranged today?
A
Atomic number
2
Q
Before discovery of sub atomic particles, how was the periodic table arranged?
A
Atomic mass
3
Q
What were the early problems with the periodic table?
A
Not many elements discovered, atomic weights were inaccurate, no gaps left for unknowns, not every element followed the pattern
4
Q
How did Mendeleev overcome each problem with his periodic table?
A
Followed the pattern, left spaces for new elements (and predicted unknowns)
5
Q
What happened for scientists to believe Mendeleev’s theory?
A
Discovered a new element that fitted his prediction
6
Q
A
