History Of Periodic Table Flashcards
1
Q
Dobereiner
A
Grouped elements based on similar properties known as triads.
Atomic mass of Middle element in triad is close to the mass of other two elements
2
Q
New lands
A
Law of octaves: organized by atomic mass and the properties repeat after eight elements.
3
Q
Mendeleev
A
Periodic law, elements are arranged in order of increasing atomic mass
When element doesn’t match properties of group, he said it’s unknown and left a space.
4
Q
Mosley
A
Organized by atomic number instead of the atomic mass.
5
Q
Periodic
A
Repeating pattern
