HISTORY OF THE PERIODIC TABLE Flashcards
1
Q
Who created the first periodic table
A
Dimitri Mendeleev
2
Q
How did he groups the elements
A
By mass number
3
Q
How are elements grouped in the modern periodic table
A
By the atomic number
4
Q
Why were gaps left in his periodic table
A
He felt there was more elements to be found so he left gaps
5
Q
How to tell what group an element is in
A
The last number of each element
6
Q
How to tell what period an element is in
A
By the first electron number
