In Thomson's atomic model, positive mass occupies more space than the negative charge in an atom.

Answer

**Step-by-Step Solution:**

1. **Understanding Thomson's Atomic Model**: Thomson's atomic model, also known as the Plum Pudding Model, was proposed by J.J. Thomson in 1897 after the discovery of the electron. In this model, the atom is envisioned as a sphere of positive charge with negatively charged electrons embedded within it.

2. **Visualizing the Model**: In the Plum Pudding Model, the positive charge is represented as a 'pudding' or 'dough', which occupies most of the space in the atom. The negatively charged electrons are like 'plums' scattered throughout this positive mass.

3. **Analyzing the Statement**: The statement in the question claims that "positive mass occupies more space than the negative charge in an atom." This aligns with Thomson's model, as the positive charge (the pudding) indeed occupies a larger volume compared to the small, discrete electrons (the plums).

4. **Conclusion**: Therefore, the statement is true. In Thomson's atomic model, the positive mass does occupy more space than the negative charge.