Unit 5 Vocab And Terms Flashcards
What did J.W Dobreiner state
Organized the elements into groups of 3 with similar properties
What were the groups called that J.W. Dobreiner made
Traids
What did J.A.R Newlands state
Properties repeated every 8th element
What was the law called that J.A.R made
The law of octaves
What did J.A.R notice about the law of octaves
That it worked well for lighter elements but did not work well for heavier elements
What did Dmitri Mendez do
He organized the 1st periodic table according to increasing atomic mass and put elements with similar properties in the same group (family)
Why did Dmitri Mendez rearrange some elements out of order
To keep them together with other elements with similar properties
What did Henry Moseley state
Each element has a certain amount of positive charge in the nucleus which are called protons
What did Henry Moseley do
He reorganized the periodic table by atomic number
What was the periodic law
When elements are arranged in order of increasing atomic number, their physical and chemical properties show a repeating pattern
