Periodic table Flashcards
Who was Dmitri Mendeleev?
He made the 1st proper periodic table in 1869 called the table of elements.
How did he sort the groups?
By the elements properties and the properties of the compound.
How did he order them and why?
He order them in their atomic mass meaning he could put elements with similar properties in columns.
What went wrong when he was sorting the elements and how did he fix it?
Some elements ended up in the wrong column. So where this happened he switched the order to keep the ones with same properties in the same column
Why did Mendeleev leave gaps?
Because that element either was not discovered or he was trying to keep the elements with similar properties together.
What did Dmitri do to predict properties of undicovered elements?
Used the properties of other elements
What does the periodic table help us with?
See patterns in properties
How does the modern day periodic table order the elements?
Atomic numbers
What do groups consist of of?
Elements with similar properties ↕
What do groups show regarding the element?
How many outer electrons are in the outer shell
What do groups show regarding the element?
How many outer electrons are in the outer shell
example: Group 1 has 1 outer electron
( group 0 has a full outer shell except helium with 2 )
What do periods show?
How many shells the element has ↔
