For the transmutation shown, which of the following is x?

Choice A: carbon-12, .

Explanation:

Let

Symbol of X: .

Consider the two conservation laws:

Sum of mass numbers:

Equate the two sides:

.

Thus the mass number of X is 12.

Try the steps above to find the atomic number of X. The number on the lower-left corner of indicates that the atomic number of this neutron is zero.

.

Thus the atomic number of X is 6.

What element is X? Refer to a modern periodic table. The element with atomic number 6 is carbon. The symbol for carbon is . The mass number of this isotope is 12. The answer will be .

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