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Worksheet: Atomic Nuclei

Q1:

2 0 6 8 2 P b is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q2:

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 . 6 6 × 1 0 2 7 kg. Calculate the density of a gold nucleus in kg/ m 3 .

  • A 1 . 6 × 1 0 1 7 kg/m3
  • B 1 . 4 × 1 0 1 7 kg/m3
  • C 1 . 9 × 1 0 1 7 kg/m3
  • D 2 . 3 × 1 0 1 7 kg/m3
  • E 2 . 1 × 1 0 1 7 kg/m3

Q3:

2 1 0 8 4 P o is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q4:

5 8 2 9 C u is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q5:

2 4 1 1 N a is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

Q6:

4 5 2 0 C a is an isotope.

What is its atomic number?

What is its mass number?

What is its neutron number?

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 . 6 0 × 1 0 1 9 C.

  • A 3 . 0 4 × 1 0 1 4 m
  • B 1 . 1 8 × 1 0 1 4 m
  • C 5 . 0 5 × 1 0 1 4 m
  • D 4 . 5 4 × 1 0 1 4 m
  • E 8 . 1 1 × 1 0 1 4 m