Elements of periodic table Flashcards
1
Q
what is an element?
A
substance that cannot be broken down into anything simpler.
2
Q
what did robert boyle do
A
defined an element
3
Q
what did humphrey david do
A
discovered new elements eg Na and K
4
Q
what did john dalton do
A
made up the atomic theory
5
Q
what did dobereiner do
A
suggested elements should fit together in groups of 3 which are called triads
6
Q
what is a triad
A
group of 3 elements with similar properties
