Which of the following statement about transuranic elements is incorrect?

Options

A. These are all synthetic elements
B. These are elements of atomic number 93 and beyond
C. Elements from 92 to lawrencium are called actinides
D. These are part of fourth transition series

Answer

To determine which statement about transuranic elements is incorrect, we need to analyze each option based on the definition and properties of transuranic elements.

### Step-by-Step Solution:

1. **Understand Transuranic Elements**:
- Transuranic elements are defined as chemical elements with atomic numbers greater than 92. This means they start from atomic number 93 and go up to the highest known atomic number, which is currently 118.

2. **Evaluate Each Option**:
- **Option 1**: "These are all synthetic."
- This statement is true. Most transuranic elements (those with atomic numbers greater than 92) are synthetic and not found in nature.

- **Option 2**: "These are elements of atomic number 93 and beyond."
- This statement is also true. By definition, transuranic elements start from atomic number 93.

- **Option 3**: "Elements from 92 to Lawrencium are called actinides."
- This statement is incorrect. The actinides are the series of elements from atomic number 89 (Actinium) to 103 (Lawrencium). Transuranic elements start from atomic number 93, which means that while Lawrencium is the last actinide, the statement incorrectly includes atomic number 92 as part of the actinides.

- **Option 4**: "These are a part of transition series."
- This statement is true. Transuranic elements are indeed part of the transition metals series.

3. **Conclusion**:
- The incorrect statement about transuranic elements is **Option 3**: "Elements from 92 to Lawrencium are called actinides."

### Final Answer:
The incorrect statement about transuranic elements is **Option 3**.