Worksheet: Atomic Nuclei

In this worksheet, we will practice describing the mass and charge relationships in atomic nuclei, including unstable radioactive elements and isotopes.

Q1:

20682Pb is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q2:

4520Ca is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q3:

21084Po is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q4:

2411Na is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q5:

5829Cu is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q6:

The radius of a nucleon is approximately 1.2 fm. A gold nucleus contains 197 nucleons. A unified atomic mass unit is approximately equal to 1.66×10 kg. Calculate the density of a gold nucleus in kilograms per cubic meter.

  • A2.1×10 kg/m3
  • B1.4×10 kg/m3
  • C1.6×10 kg/m3
  • D2.3×10 kg/m3
  • E1.9×10 kg/m3

Q7:

In one of the classic nuclear physics experiments at the beginning of the twentieth century, an alpha particle was accelerated toward a gold nucleus, and its path was substantially deflected by the Coulomb interaction. If the energy of the doubly charged alpha nucleus was 5.00 MeV, how close to the gold nucleus (79 protons) could it come before being deflected?

Proton charge is +1.60×10 C.

  • A4.54×10 m
  • B3.04×10 m
  • C1.18×10 m
  • D8.11×10 m
  • E5.05×10 m

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