Development of the periodic table

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5 Terms

1
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What are rows called in the periodic table

Periods

2
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What are columns called in the periodic table

Groups

3
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What do elements in the same group have in common

Same amount of electrons in outer shells

Similar chemical properties

4
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What do elements in the same period have in common

The amount of electron shells

5
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What did mendeleev do when creating the periodic table

left empty spaces for undiscovered elements