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Deamoura:
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.
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Divergent0997:
Is his a check all that apply?
Deamoura:
yea
JSVSL7:
Same period means same principle quantum number (A), and as you go from left to right it transitions from metal to metalloid then nonmetal and noble gases (D). The valence as you go from left to right changes, so they do not have similar chemical characteristics. So A and D
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