June 2017 NY Regents Chemistry Exam
47 Given the equation representing a nuclear reaction:
The particle represented by X is
Solution: To find X, we must find the mass number and the atomic number. To find mass number we add masses(on top) on the reactant side and make it equal to the sum of masses on the product side.
We do 1+x = 6+4 x=9. Mass must be 9, eliminating choices 3 and 4. Next we do the same for atomic number (bottom numbers). 1+y = 3+2 y=4. The atomic number is 4.
Next, we are going to check which element has an atomic number of 4 on the Periodic Table. Be has a mass number of 4.
Answer: 2
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