1. Element: A pure substance made of only one kind of atom
2. Compound: A substance made up of atoms of two or more different elements joined
by chemical bonds
3. Periods: Horizontal rows of elements on the periodic table
4. Groups or Families: Vertical columns on the periodic table
5. Metals: - Most of the elements are this type
- Left end of the periodic table
- Good conductors of heat and electricity
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