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

Choice A: carbon-12, .

Explanation:

The number on the top-left corner of each particle is its mass number. The number on the lower-left corner of each particle is its atomic number.

Let

the mass number of X be A, andthe atomic number (a.k.a. proton number) of X be Z.

Symbol of X: .

Consider the two conservation laws:

Sum of mass numbers on the left-hand side = Sum of mass numbers on the right-hand side.Sum of atomic numbers on the right-hand side = Sum of atomic numbers on the right-hand side.

Sum of mass numbers:

Left-hand side: 9 + 4;Right-hand side: A + 1.

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 .

I'm not sure but i will try to find out

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)