Unit 4: Period Table Organization

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Description and Tags

Chemistry

Chemical Reactions

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10 Terms

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period #

number of energy levels

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group #

number of valence electrons

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valence electrons

atomic number

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valence electrons in group

group #

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find electrons

atomic #

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Mendeleev's Periodic Table

based on increasing atomic mass, read from top to bottom.

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Mosley's Periodic Table

arranged elements based on atomic #, worked with Rutherford.

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groups or families

vertical columns with similar chemical properties.

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if elements have similar properties…

they react in similar ways when they have the same amount of valence electrons.

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# of groups and periods

18 groups, 7 periods