among the elements 2He^4,7N^14,12Mg^24 and 4Be^8,the elements which belong to the same period in the modern periodic table are
A. 2He^4 and 4Be^8
B. 7N^14 and 4Be^8
C. 12Mg^24 and 2He^4
D. 4Be^8 and 12Mg^24
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Explanation:
D. 4Be^8 and 12Mg^24......
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