Multiple choice What is the value of the nuclear reaction4Be? + 2He4 ----------------> 6C12 + 0n1 ? 4 8 6 9 Reveal answer Fill a bubble to check yourself D Correct answer Explanation The student may have made some calculation mistakes and solved as under: According to law of conservation of mass number. ? + 4 = 12 + 1so value of ? . Answer = 9