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Chem Chap 5 Sec 1

History of the Periodic Table

QuestionAnswer
A repeating pattern periodic
How did Mendeleev arange the elements in his first published periodic table Vertical
How is the atomic mass of each element indicated in Mendeleev's 1st periodic table By the number followiing the elements sysmbol
In Mendeleev's 1st periodic table how were the unknown elements indicated by a question mark
How did Memdeleev arrange the elements in the first table Similar properties were grouped together
What 3 elements were missing from mendeleev's table but were later discovered scandium, Sc, gallium, Ga, adn germanium, Ge
What did Moseley work lead to The Modern definition of atomic number and teh recognition that atomic number not atomic mass is the basis for the organization of the periodic table.
The physical and chemical properties of the elements are periodic functions of their atomic numbers Periodic law
An arrangement of teh elements in order of their atomic numbers so that elements with similiar properties fall in the same column, or group. Periodic Table
What was the most significant addition to the periodic table The discovery of the noble gases
Helium had been discovered as a component of The sun
Who proposed that a new group be added to the periodic table to fit argon and helium Ramsey
The 14 elements with atomic numbers from 58 to 71. Lanthanides
The 14 elements with atomic numbers from 90 to 103 actinides
The lanthanides and actinides belong in what period of the Periodic table Periods 6 and 7
created a table in which elements with similar properties were grouped together Mendeleev
discovered that the elements fit into patterns better when they were arranged according to atomic number, rather than atomic weight Moseley
Created by: tbstinso
 

 



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