Chemistry- Periodic Table

Subdecks (3)

in the 1800s, what were elements grouped in?
by atomic mass or physical and chemical properties
what happened in 1817?
Johann Dobereiner attempted to group similar elements
what were the elements Johann Dobereiner grouped called?
Dobereiner Triads
What did Johann Dobereiner discover?
that chlorine, bromine and iodine had similar characteristics- that bromines atomic weight fell halfway between chlorine and iodine
What happened in 1863?
John Newland created the first table of elements
how did John Newland arrange the elements?
order of mass
what did John Newland discover?
that similar elements appeared at regular intervals- every 8th element
What was the Law John Newland discovered called?
The Law of Octaves
What messed John Newlands discovery up?
in the third row of 7, the transition metals messed it up- Fe,Zu
How did Dmitri Mendeleev arrange elements?
by atomic mass
What did Dmitri Mendeleev do?
he left gaps for undiscovered elements, and also predicted properties of undiscovered elements
What were some of the elements predicted by Mendeleev?
Scandium, Gallium
Who created one of the modern Periodic tables?
Henry Moseley
How did Henry Moseley arrange elements?
by increasing atomic(proton) number