Who made it
- Dmitri Mendeleev discovered the Periodic Table of Elements.
What it represents
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| Carbon is a solid at room temperature. |
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| Bromine is a liquid at room temperature. |
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| This is a helium atom. Helium is a gas at room temperature. |
- The columns represent groups, or families. Families of elements has similar properties.
- The rows represent periods.
- Metals, metalloids, and nonmetals represent three colors.
- The elements go in ascending order by atomic number.
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