History of the Periodic Table Flashcards
1
Q
Old periodic table features
A
ordered by atomic weight, was incomplete, element were missing and they were in inappropriate groups
2
Q
Mendeleev’s periodic table features
A
left gaps, still ordered based on atomic weight but also changed the order
3
Q
Modern periodic table features
A
With the discovery of the proton they ordered by atomic number, discovered group 8 and replaced missing gaps
4
Q
What does a group tell you
A
tells you the number of electrons on the outer shell of the elements
5
Q
What does a group tell you about its properties?
A
Elements in the same group of show trends in physical properties and chemical properties
6
Q
What is a period?
A
name given to a horizontal row of the periodic table
