Unit 4 - The Periodic Table Flashcards
Who was the designer of the periodic table?
Dmitri Mendeleev
What was different about Mendeleev’s periodic structure compared to other chemists?
He left gaps
Why did Mendeleev sometimes swap elements
Depending on their chemical properties
Why did Mendeleev leave gaps?
He assumed that there were elements that hadn’t been discovered yet
How are the elements in the periodic table arranged today? Vertically and horizontally
Vertical columns show elements with similar properties
Horizontal rows show an increase in atomic number
What is eka-aluminium
A predicted element by Mendeleev based on the properties of discovered elements
What does inert mean
Very unreactive
What group do inert elements fit into
Group 0
How did Mosley show that the atomic number of an atom also showed its physical properties?
He fired high-energy electrons at different elements which made them give off x-rays and noticed that for every increase in proton, the energy of the x-rays weredifferent
What is the period and a group
Period is a row
Group is a column
Where are the non-metals in the periodic table
On the right
How did Mendeleev order the periodic table
Increasing relative atomic mass and chemical properties
What’ are electrons arranged in an atom
Electron shells
What is the electronic configuration
How the electrons in an atom are arranged
What is the written electronic configuration for sodium?
2.8.1
