The Periodic Table
The periodic table is not just a random order of elements, it has logic and reason! It can be used to predict the structure and properties of elements.
But First, Electron Shells!
- Electrons exist in shells around the atom.
- Shell one can take two electrons, and shells two and three can take eight electrons.
- A row is called a period.
- Moving left to right on a period, the atomic radius decreases, and the electronegativity increases
Electronegativity: how hard it is to remove an electron
- A column is called a group.
- A group tends to have similar valence shell electron configurations, while increasing the number of shells as you descend.
Valence Shell: The outermost shell