Let the product be X
Balance mass number on both sides
mass of Fm = mass of n + 2*mass of X
1*256 = 4*1 + 2*M
M = 126
Balance atomic number on both sides
atomic of Fm = atomic of n + 2*atomic of X
1*100 = 4*0 + 2*A
A = 50
Atomic number 50 is for element Sn
So, the product is
126-Sn
Answer:
126
Sn
50
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