Chapter Thirteen NUCLEI
A worksheet covering the composition, size, and energy of atomic nuclei, including radioactivity, fission, and fusion. Total: 40 marks.
Section A: Fill in the Blanks [20 Marks]
Complete the following sentences with the correct term or value.
The positive charge and mass of an atom are densely concentrated at its center, forming the ________.
The radius of a nucleus is smaller than the radius of an atom by a factor of about ________.
The unit used for expressing atomic masses, defined as 1/12th of the mass of a carbon-12 atom, is the ________.
Atomic species of the same element that differ in mass are called ________.
The neutral radiation observed by James Chadwick in 1932 was found to consist of particles called ________.
Section B: Multiple Choice Questions [20 Marks]
Choose the one correct answer for each question.