Transuranium elements are

Options

A. elements that have been postulated but not found naturally or produced artificially
B. man-made elements with more than 92 protons in the nucleus
C. found naturally in abundance greater than that of uranium isotopes
D. found on earth as a result of bombardment by particles from the planet Uranus .

Explanation

**Step-by-Step Solution:**

1. **Understanding Transuranium Elements:**
- Transuranium elements are defined as elements that have an atomic number greater than 92, which is the atomic number of Uranium. This means they have more protons in their nucleus than Uranium.

2. **Characteristics of Transuranium Elements:**
- These elements are generally unstable and radioactive. They tend to decay into other elements over time through radioactive decay processes.

3. **Examples of Transuranium Elements:**
- Some examples include:
- Curium (Cm) with atomic number 96
- Americium (Am) with atomic number 95
- Einsteinium (Es) with atomic number 99
- Nobelium (No) with atomic number 102

4. **Clarifying Misconceptions:**
- It is important to note that transuranium elements are not found naturally in significant amounts; they are primarily man-made through artificial processes in laboratories or nuclear reactors.

5. **Evaluating Options:**
- The options provided in the question need to be evaluated based on the definition and characteristics of transuranium elements:
- Option 1: Incorrect, as transuranium elements are not just postulated but have been produced artificially.
- Option 2: Correct, as it accurately describes transuranium elements as man-made elements with more than 92 protons.
- Option 3: Incorrect, as they are not found naturally in abundance greater than uranium isotopes.
- Option 4: Incorrect, as they are not formed as a result of bombardment from particles from the planet Uranus.

6. **Conclusion:**
- The correct answer is Option 2, which states that transuranium elements are man-made elements with more than 92 protons in the nucleus.