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State two characteristics shared by elements of the same group in the periodic table

User WillEnsaba
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Groups are vertical columns in the Periodic Table and they contain elements with similar properties. One characteristic is that each member of a group has the same number of electrons in the outer level. This holds true for groups 1-7. Because each element has the same number of electrons in the outer shell, they tend to have similar properties(second characteristic). 
User Mageek
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