Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
21 Cards in this Set
- Front
- Back
Johann Dobereiner
|
-1829
-Model of Triods |
|
A.E. Beguyer de Chancourtois
|
-1862
-Periodic Cylinder |
|
John Newlands
|
-1863
-Law of octaves |
|
Dimitri Mendeleyev
|
-1869
-Father of modern p. table -He published a table of the elements organized by increasing atomic mass |
|
Lothar Meyer
|
-1869
-Published his own table of the elements organized by increasing atomic mass |
|
Mendeleev vs. Meyer
|
-Both arranged the elements in order of increasing atomic mass
-Both left vacant spaces where unknown elements should fit -Mendeleev used his table to predict the chemical properties of 3 elements that were unknown -Mendeleev ended up being very accurate and after the discovery of these elements Mendeleev's table was generally accepted. |
|
Mendeleev's 15 minutes of fame
|
-Great accomplishment but problems arose when new elements were discovered and more accurate atomic weights were determined.
|
|
Henry Moseley
|
-1913
-Determined the nuclear charge (atomic #) of elements and rearranges them by increasing atomic number. |
|
Glenn T. Seaborg
|
-1951
-He proposed a new p. table by moving 14 elements out of the main body to the bottom. He called it the Actinide series. |
|
Periods
|
Horizontal rows in p. table
|
|
Groups
|
Vertical columns, also called families.
|
|
Periodic Law
|
When elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties.
|
|
Model of Triods 1829
|
Johann Dobereiner
|
|
Periodic Cylinder
|
-Ordered the elements by increasin atomic height. A.E. noticed a pattern in closely related elements in every 16th space
-A.E. Beguyer de Chancourtois |
|
Law of Octaves
|
-Law states that "any given element will exhibit analogous behavior to the eighth element following it in the table.\
-John Newlands |
|
This person published a table of the elements organized by increasing atomic mass
|
-Dmitri Mendeleyev
|
|
This person published his own table of the elements by increasing atomic number but was eventually forgotten.
|
-Lothar Meyer
|
|
Father of the modern P. table
|
-Dmitri Mendeleyev
|
|
Why was Mendeleyev more succeful than Meyer
|
Both left spaces but Mendelyeve predicted open spaces and was right
|
|
This person determined that the nuclear charge of elements and rearranges them by increasing atomic number
|
Moseley
|
|
This person proposed a new p. table by moving 14 elements out of the main body to the bottom. He called it the Actinide sets
|
-Glenn T. Seaborg
|