A man made white silvery metal,radioactive innature has a strong tendency to form oxocations and complexes. It is used as nuclear fuel in atomic reactors. The metal is a

Options

A. Lanthanide
B. Actinide
C. Transition metal representative element
D. S block element

Explanation

To solve the question, we need to analyze the clues provided in the statement:

1. **Man-made white silvery metal**: This indicates that the metal is not found naturally and has been synthesized in a laboratory or through artificial means.

2. **Radioactive in nature**: This suggests that the metal is unstable and emits radiation, which is a characteristic of certain elements in the periodic table.

3. **Strong tendency to form oxocations and complexes**: This property is often associated with transition metals and some post-transition metals, but in this context, it points towards specific groups of elements.

4. **Used as nuclear fuel in atomic reactors**: This is a crucial hint as it indicates that the metal is part of the actinide series, which includes elements commonly used in nuclear applications.

Based on these clues, we can conclude the following:

- The mention of "man-made" and "radioactive" suggests that we are dealing with synthetic elements, which are primarily found in the actinide series.
- The actinides are known for their ability to form various oxocations and complexes due to their variable oxidation states.
- Elements like Uranium (U) and Plutonium (Pu) are well-known actinides that are used as nuclear fuel.

Therefore, the metal described in the question is likely **Plutonium (Pu)**.

### Step-by-Step Solution:
1. Identify the characteristics of the metal: man-made, white silvery, radioactive.
2. Recognize that the radioactive nature points towards elements in the lanthanide and actinide series.
3. Note the strong tendency to form oxocations and complexes, which is common in actinides.
4. Acknowledge that the use of the metal as nuclear fuel specifically indicates it belongs to the actinide series.
5. Conclude that the metal is **Plutonium (Pu)**, as it fits all the criteria.