Question | Answer |
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 |