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IA2
IIA3
IIiB4
IvB5
VB6
VIB7
VIIB8
VIIIB9
VIII10
VIII11
IB12
IIB13
IIIA14
IVA15
VA16
VIA17
VIIA18
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N2,5Li2,1Al2,8,3Ne2,8Cl2,8,7 ABC378() ?() He ?() B () A C II
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