Question

among the elements 2He4 7N14 12Mg24 and 4He8 the elements which belong to the same period in the modern periodic table​

Answer 1

Answer:

first of all the last element should be 4Be8 so Be and N will lie in the same period

Answer 2

Out of 2He4 ,7N14 ,12Mg24 and 4Be8 elements N and Be belong to same period that is period second.

Explanation:

N represents nitrogen and Be represents Berrylium . They both belong to second period. However Berrylium is a metal and nitrogen is a non metal.