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OpenStudy (anonymous):

What is common about the elements of a period? They have the same number of electron shells. They have similar chemical characteristics. They have similar physical characteristics. They transition from a metal to noble gas.

OpenStudy (stmoney):

electron shells

OpenStudy (anonymous):

there can be more then one answer?

OpenStudy (anonymous):

elements in the same period have the same number of occupied energy levels. Hope this helps! :)

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