Scelta multipla
Tin has atomic number 50. How many neutrons are in an atom of tin-120 (Sn-120)?
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4. Atoms and Elements
Isotopes
Scelta multipla
For an atom with mass number and atomic number , how do you determine the number of neutrons () in the atom?
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Guida verificata passo dopo passo1
Understand the definitions: The mass number \(A\) represents the total number of protons and neutrons in the nucleus of an atom, while the atomic number \(Z\) represents the number of protons.
Recall that the number of neutrons \(N\) is the difference between the total nucleons (protons + neutrons) and the number of protons alone.
Set up the equation to find the number of neutrons: \(N = A - Z\).
Interpret the equation: subtracting the atomic number \(Z\) (protons) from the mass number \(A\) (protons + neutrons) gives the number of neutrons \(N\).
Use this formula to calculate the number of neutrons for any atom when you know its mass number and atomic number.
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