Answers

2015-10-27T20:32:20+05:30
in period-2 there are 8 elements present.they are :lithium,berylium,boron,carbon,nitrogen,oxygen,fluorine,neon 

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2015-10-27T20:53:07+05:30
 number of elements present in period -2 is 8 like lithum,neon...etc
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