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- 1. Organized by increasing atomic mass
- 2. Elements with similar properties grouped together
- 3. Some descrepencies
- 1. Organized by increasing atomic number
- 2. Resolved descrepencies in Mendeleev's
- 3. Theory still accepted
What Group are the Alkali Metals in?
What Group are the Alkaline Earth Metals in?
What is the name of the elements in the d-block (groups 3-12)?
What group names make up the f-block of elements?
Lanthanides and Actinides
How many valence electrons do the Noble Gases have?
8 Valence electrons
How many valence electrons do the halogens have?
7 valence electrons
What is the trend for atomic radii?
Biggest radii to the left and bottom
What is the trend for electronegativity, electron affinity, and first ionization energy?
Up and to the right
Why are the largest atomic radii to the left and down?
They are bigger going down becuase another energy level is added every time you go down a period. They're bigger to the left because they have less protons attracting the electrons in.