Periodicity- The Periodic Table 3.7.1 Flashcards
1
Q
How Mendeleev arrange elements?
A
In order of relative atomic mass, when nothing was known about subatomic particles and atoms at the time.
2
Q
How were the elements lined in their groups?
A
They were lined in groups with similar properties
3
Q
Why did Mendeleev leave gaps and swap elements around?
A
He assumed that the atomic measurements were incorrect and that some elements were yet to be discovered.
4
Q
What is periodicity?
A
A repeating trend in properties- due to the position of the elements being linked to their physical and chemical properties.
5
Q
What determines the order of elements in the periodic table
A
The number of protons in the nucleus
