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Copper has atomic number 29. How many neutrons are in an atom of the isotope copper-63?
163
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4. Atoms and Elements
Isotopes
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A period 5 transition metal has 51 neutrons. If the element is yttrium, what is the mass number of this isotope? (Atomic number of Y is .)
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Identify the atomic number (Z) of yttrium (Y), which is given as 39. The atomic number represents the number of protons in the nucleus of the atom.
Note the number of neutrons (N) provided in the problem, which is 51 for this isotope of yttrium.
Recall that the mass number (A) of an isotope is the sum of the number of protons and neutrons in the nucleus. This can be expressed as the formula: \(A = Z + N\).
Substitute the known values into the formula: \(A = 39 + 51\).
Add the values to find the mass number of the isotope, which represents the total number of nucleons (protons + neutrons) in the atom.
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