The Bohr Model
What are the energy levels in the Bohr model called?
Shells
What is an element?
A pure substance that cannot be broken down into simpler substances by chemical means.
Where are electrons in the Bohr model?
Outside the nucleus, in shells
Give an example of an element and its symbol.
Sodium (Na) or Magnesium (Mg)
What determines the chemical properties of an element according to the Bohr model?
The arrangement of electrons (in the valence shell)
What two categories is the periodic table organised into (rows and columns)?
Groups (families) and periods.
What is the outermost energy level of an atom called?
Valence shell
What are compounds?
Substances made up of two or more different elements chemically combined.
What is the maximum capacity for the first three electron shells?
1st = 2 electrons
2nd = 8 electrons
3rd = 8 electrons
How are elements organized in the periodic table?
Based on their atomic number