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Columns on the periodic table.
- 1) alkali metals
- 2) alkaline earth metals
- 7) halogens (in compounds, haylides)
- 8) noble gases (unreactive)
What are the main group elements?
First two columns and the last six columns
What are the transition elements?
Everything between the main group elements
What is the mass formula?
A (mass #) = # of protons + # of neutrons
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